gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] strange behavior on calling gnuplot from cgi script written in python

[Steve C. <sc...@ja...>]

OK, I feel like an idiot but I guess I'm really not understanding you
even after reading the document you referred me to.  The specific words
I'm not understanding are "going separate ways".

To that end I've gone back to basics and rewritten the example on p. 241
in python.  I believe my translation is more or less exact:

================================
#!/usr/bin/python

import os
import math

print "Content-Type: image/png"     # This is an image
print                               # blank line, end of headers

gp = os.popen("/usr/bin/gnuplot", 'w')
gp.write("set term png;set o;")
gp.write("plot '-' u 1:2 w linesp\n")

xs = [a/10.0 for a in range(0,101,1)]
for x in xs:
    y = x * math.sin(x)
    gp.write( "%f %f\n" % (x, y))
gp.write("e\n")
gp.close()



=================================

This fails with the following message
[error] [client ::1] malformed header from script. Bad header=\x89PNG:

whether or not the gp.close() line is commented out.

What am I missing?





Thomas Sefzick wrote:
> seems that your header:
> 
> print "Content-Type: image/png"     # This is an image
> print                               # blank line, end of headers
> 
> and gnuplots output (png graphics) are going different
> ways, because the png graphics is sent without header
> (a png file starts with "\x89PNG").
> 
> have a look at the section "Object Headers" in
> http://marc.merlins.org/htmlearn/misc/cgi-faq.txt
> 
> 
> stevecoh1 wrote:
>> Here's the error:
>>
>>  [error] [client ::1] malformed header from script. Bad header=\x89PNG:
>> usage_graph.cgi
>>

...

Re: [Gnuplot-info] strange behavior on calling gnuplot from cgi script written in python

[Thomas S. <t.s...@fz...>]

seems that your header:

print "Content-Type: image/png"     # This is an image
print                               # blank line, end of headers

and gnuplots output (png graphics) are going different
ways, because the png graphics is sent without header
(a png file starts with "\x89PNG").

have a look at the section "Object Headers" in
http://marc.merlins.org/htmlearn/misc/cgi-faq.txt


stevecoh1 wrote:
> 
> Here's the error:
> 
>  [error] [client ::1] malformed header from script. Bad header=\x89PNG:
> usage_graph.cgi
> 
> I don't understand this.  How could closing the gnuplot process create a
> malformed header yet leaving it open produces usable output?  Still, I
> guess that's a clue.  I just don't know what it means.
> 
> Here is the guts of the script, deliberately leaving out details:
> 
> #!/usr/bin/python
> 
> import cgi
> import MySQLdb
> import os
> 
> parms = cgi.FieldStorage()
> 
> print "Content-Type: image/png"     # This is an image
> print                               # blank line, end of headers
> 
> 
> # open database connection
> ...
> # create a cursor
> cursor = db.cursor()
> 
> # execute SQL query
> cursor.execute(query % (userid))
> 
> # get the resultset as a tuple
> result = cursor.fetchall()
> ...
> # open gnuplot process
> gp = os.popen("/usr/bin/gnuplot, 'w')
> 
> # initialize the plot with desired settings including definition of
> # "weekday" function.
> ...
> 
> # send plot command to gnuplot process
> gp.write("""plot '-' u 1:(weekday(timecolumn(1)) ? column(2) : 0/0) ti
> "Weekday" w impulses,  \
>      ''  u 1:(weekday(timecolumn(1)) ? column(2) : 0/0) ti "Weekend" w
> impulses\n""")
> 
> # send data to the plot command
> for record in result:
>     gp.write("%s %2.3f %d\n" % record)
> gp.write("e\n")
> 
> #bombs out if following is uncommented.
> #gp.close()
> 
> Again, I can't see anything here that would work if the gnuplot process
> was left open but fail if it is closed.
> 
> 
> Thomas Sefzick wrote:
> 
>> there should be information about what caused the error in
>> the error-log of the http-server.
>> 
>> 
>> stevecoh1 wrote:
>>> Am trying to use gnuplot as a subprocess to a CGI script written in
>>> python (similar to the perl script on p. 241 of "Gnuplot in Action").
>>>
>>> The python script itself follows the pattern of the python script on
>>> p.230-231, that is
>>>
>>> gp = os.popen( ' /usr/bin/gnuplot', 'w')
>>> ... plotting commands
>>> gp.close()
>>>
>>> The cgi script produces a 500 error.
>>>
>>> But, if I comment out the gp.close() command, it works perfectly, and
>>> produces the graph I want.  What is going on here?
>>>
>>>
>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>>> 30-Day 
>>> trial. Simplify your report design, integration and deployment - and
>>> focus
>>> on 
>>> what you do best, core application coding. Discover what's new with
>>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>>> _______________________________________________
>>> Gnuplot-info mailing list
>>> Gnu...@li...
>>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>>
>>>
>> 
> 
> 
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
> 30-Day 
> trial. Simplify your report design, integration and deployment - and focus
> on 
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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Re: [Gnuplot-info] Getting more plots on one!

[Thomas S. <t.s...@fz...>]

redefine xtics with empty labels for the 2nd plot

...
set multiplot
## First plot from bottom------------------------------------
set size SX,SY
set origin OX,OY
set xtics ("M5.0" 1.00000, "M6.0" 2.00000, "M7.0" 3.0, "M8.0" 4.0, "M9.0"
5.0) 
set xlabel "Spectral Type"
plot sin(x)

## Second plot from bottom------------------------------------
set origin OX,PY+OY
unset xlabel
set xtics ("" 1.00000, "" 2.00000, "" 3.0, "" 4.0, "" 5.0) 
plot cos(x)
...



Trillianx wrote:
> 
> Hello Thomas, 
> 
> Thanks for your script. It worked wonderfully. The final thing I need is
> to change the xtics to alphabets. For this beside xtics in the" first plot
> from bottom", I type the following: 
> 
> set xtics ("M5.0" 1.00000, "M6.0" 2.00000, "M7.0" 3.0, "M8.0" 4.0, "M9.0"
> 5.0) 
> 
> However when I do that the formatting changes again as you can see from
> the screenshot. The set x2tics works well but not the xtics. Why is that?
> And how can you rectify it? Here is the code again: 
> 
> 
> reset
> #set terminal postscript eps monochrome "Times-Roman" 10
> #set output "data.eps" 
> #set size 1.4,1.4
> ##----Setting small tics
> set mytics
> set mxtics
> unset key
> 
> ##--Setting y-range for all plots
> #set yrange[0.5:7]
> set xrange[0:6]
> 
> ## Setting ylabels for all plots
> set ylabel "EW (A)"
> 
> ##Defining variables
> SX = 0.5; SY = 0.2
> OX = 0.05; OY = 0.05
> NX = 1; NY = 3
> #set ytics 0.0,2,7
> set xtics 0.0,1,6
> ## define and then unset x2tics for later use
> set x2tics 0.0,1,6
> unset x2tics
> PY = 0.198
> 
> ##Setting margins
> set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
> set size SX*NX+OX*1.5, SY*NY+OY*1.8
> 
> ## reserve some space for x- and y-labels by shifting
> ## the plots a little bit
> OX=1.7*OX
> OY=1.5*OY
> 
> set multiplot
> ## First plot from bottom------------------------------------
> set size SX,SY
> set origin OX,OY
> set xtics
> set xtics ("M5.0" 1.00000, "M6.0" 2.00000, "M7.0" 3.0, "M8.0" 4.0, "M9.0"
> 5.0)
> set ytics 0.0,2,7
> set yrange[0.5:7]
> set xlabel "Spectral Type"
> plot "order65.dat" 
> 
> ## Second plot from bottom------------------------------------
> set origin OX,PY+OY
> unset xlabel
> set yrange[0.5:10]
> set ytics 0.0,2,10
> set xtics format ""
> plot "order65_2.dat"
> 
> ## Third plot from bottom-------------------------------------
> set origin OX,PY*2 + OY
> set yrange[0:6]
> set ytics 0.0,2,6
> plot "order61.dat"
> 
> ## Fourth plot from bottom------------------------------------
> set origin OX,PY*3 + OY
> ## switch x2tics on
> set x2tics ("M5.0" 1.00000, "M6.0" 2.00000, "M7.0" 3.0, "M8.0" 4.0, "M9.0"
> 5.0)
> set yrange[0.5:5]
> set ytics 0.0,2,5
> plot "order61_2.dat"
> unset multiplot 
> 
> 
>  http://old.nabble.com/file/p26363853/screen-capture.jpg 
> 
> 
> Thomas Sefzick wrote:
>> 
>> have a look at this script:
>> 
>> reset
>> 
>> ##----Setting small tics
>> set mytics
>> set mxtics
>> unset key
>> 
>> ##--Setting y-range for all plots
>> set yrange[0:1]
>> 
>> ## Setting ylabels for all plots
>> set ylabel "EW (A)"
>> 
>> ##Defining variables
>> SX = 0.9; SY = 0.2
>> OX = 0.05; OY = 0.05
>> NX = 1; NY = 3
>> set ytics -0.6,0.2,0.8
>> set xtics -10.0,2,10
>> ## define and then unset x2tics for later use
>> set x2tics -10.0,2,10
>> unset x2tics
>> PY = 0.198
>> 
>> ##Setting margins
>> set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
>> set size SX*NX+OX*1.5, SY*NY+OY*1.8
>> 
>> ## reserve some space for x- and y-labels by shifting
>> ## the plots a little bit
>> OX=1.7*OX
>> OY=1.5*OY
>> 
>> set multiplot
>> ## First plot from bottom------------------------------------
>> set size SX,SY
>> set origin OX,OY
>> set xtics
>> set xlabel "Spectral Type"
>> plot sin(x)
>> 
>> ## Second plot from bottom------------------------------------
>> set origin OX,PY+OY
>> unset xlabel
>> set xtics format ""
>> plot cos(x)
>> 
>> ## Third plot from bottom-------------------------------------
>> set origin OX,PY*2 + OY
>> plot tan(x)
>> 
>> ## Fourth plot from bottom------------------------------------
>> set origin OX,PY*3 + OY
>> ## switch x2tics on
>> set x2tics
>> plot sin(x)*exp(x)
>> unset multiplot
>> 
>> 
>> Trillianx wrote:
>>> 
>>> Sorry, in my previous post I am able to get solutions for question (1)
>>> and (2). However I cannot find an answer to Question (3). Thus please
>>> ONLY address question (3). Which is: 
>>> 
>>> 3. I would like to have the xtics to appear for all plots but the
>>> numbers ONLY for the bottom plot. How do I make it happen? 
>>> 
>>> Thanks! 
>>> 
>>> Trillian. 
>>> 
>>> 
>>> Trillianx wrote:
>>>> 
>>>> I have been using the multiplot function in gnuplot to recreate the
>>>> plot from my first post. I am using gnuplot 4-2.5, However I have few
>>>> problems ( Please scroll down to see the attached plot. 
>>>> 
>>>> 1. The ylabel does not work for all plots. Where should I position the
>>>> ylabel? 
>>>> 2. I would like to have the xlabel ONLY for the bottom plot. Where do I
>>>> place the xlabel? Positioning as you can see in the code does not work. 
>>>> 3. I would like to have the xtics to appear for all plots but the
>>>> numbers ONLY for the bottom plot. How do I make it happen? 
>>>> 
>>>> ##----Setting small tics
>>>> set mytics
>>>> set mxtics
>>>> unset key
>>>> 
>>>> ##--Setting y-range for all plots
>>>> set yrange[0:1]
>>>> 
>>>> ## Setting ylabels for all plots
>>>> set ylabel "EW (A)"
>>>> 
>>>> ##Defining variables
>>>> SX = 0.9; SY = 0.2
>>>> OX = 0.05; OY = 0.05
>>>> NX = 1; NY = 3
>>>> set ytic -0.6,0.2,0.8
>>>> set xtic -10.0,2,10
>>>> PY = 0.198
>>>> 
>>>> ##Setting margins 
>>>> set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
>>>> set size SX*NX+OX*1.5, SY*NY+OY*1.8
>>>> 
>>>> set multiplot
>>>> ## First plot from bottom------------------------------------
>>>> set size SX,SY
>>>> set origin OX,OY
>>>> set xtics
>>>> set xlabel "Spectral Type" 
>>>> plot sin(x)
>>>> 
>>>> ## Second plot from bottom------------------------------------
>>>> set origin OX,PY+OY
>>>> unset xlabel
>>>> unset xtics
>>>> plot cos(x)
>>>> 
>>>> ## Third plot from bottom-------------------------------------
>>>> set origin OX,PY*2 + OY
>>>> plot tan(x)
>>>> 
>>>> ## Fourth plot from bottom------------------------------------
>>>> set origin OX,PY*3 + OY
>>>> plot sin(x)*exp(x)
>>>> unset multiplot
>>>> 
>>>> Thank you so much!! 
>>>> 
>>>> Rohit 
>>>> 
>>>>  http://old.nabble.com/file/p26351939/screen-capture-1.jpg 
>>>> 
>>>> Trillianx wrote:
>>>>> 
>>>>> I am not sure how to describe this but I would like to create plots
>>>>> that look like those in the attached figure. How do you create these?
>>>>> Please note that this is just on plot with many subplots. 
>>>>> 
>>>>> I know the basics of GNUPLOT but I am not sure how to put the plots
>>>>> together as shown in the attached figure. So please just tell me how
>>>>> to stack them one top of the other. 
>>>>> 
>>>>> Thank you so much !!
>>>>>  http://old.nabble.com/file/p26230858/screen-capture-1.jpg 
>>>>> 
>>>>> 
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
> 
> 

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[Gnuplot-info] public transport plotting

[Wolf D. <dre...@ve...>]

Hello friends,
Guten Morgen,

thanks for hints by Thomas and Hans-Bernhard (da könnten wir ja fast  
auf gut Deutsch weitermachen… (-;)

With your support I found nicely working solutions for my tasks:

This one plots the name of a bus stop left (column 1), the number of  
boarding passengers (column 2) right besides circles, these are  
positioned according to their geographic coordinates (column 3&4).

Confusing is the behaviour of the "offset" command - to find this  
setup took very much trial and error.

schnipp++++++++++++++++++++++++++++++++++++++++++++++++++++
set terminal svg fixed enhanced fsize 1

unset border
unset xtics
unset ytics

set output "Augangsdaten.svg"

plot [4430000:4467900] [681000:668691] "Eingangsdaten.csv" using 3:4: 
((abs($1))*0.05) with points pointtype 6 pointsize variable notitle,  
"Eingangsdaten.csv" using ($3+(abs($1))):4:2 with labels left offset  
0.75,0 notitle, "Eingangsdaten.csv" using ($3-(abs($1))):4:1 with  
labels right offset -0.75,0 notitle
unset output

schnapp++++++++++++++++++++++++++++++++++++++++++++++++++++

The other one plots lines showing passengers travelling from a number  
of stops to other stops.
Columns 1-4 do contain the x,y-coordinates of bus stops, column 5  
contains the number of passengers, these are plotted in the middle of  
each line, columns 6&7 do contain the names of the bus stops at the  
beginning and the end.

Thanks a lot for pointing me to the "with vectors" command - this was  
the breakthrough. The very clou would be a possibility to modulate  
the thickness of vectors by the number of passengers - bus as I do  
have to rework it afterwards anyways, it is not so important.

schnipp ++++++++++++++++++++++++++++++++++++++++++++++++++++

set terminal svg fixed enhanced fsize 1

unset border
unset xtics
unset ytics

set output "Ergebnis.svg"

set xrange [4433000:4467900]
set yrange [689410:658691]

plot "Eingangsdaten.csv" using 1:2:($3-$1):($4-$2) with vectors  
nohead lw .5,  "Eingangsdaten.csv" using (($1+$3)/2):(($2+$4)/2):5  
with labels, "Eingangsdaten.csv" using 1:2:6 with labels,  
"Eingangsdaten.csv" using 3:4:7 with labels

unset output

schnapp ++++++++++++++++++++++++++++++++++++++++++++++++++++

Specialized software which does the same costs 10.000s of Euros…

Thanks a lot and greetings,

Wolf

Am 09.11.2009 um 14:48 schrieb Hans-Bernhard Bröker:

> Wolf Drechsel wrote:
>> Given is a list, each line is containing two sets of x-y- 
>> coordinates.  Each linie should produce one stroke in the plot,  
>> leading from  coordinate set 1 to coordinate set 2.
>
> If all such lines are strictly single (no sequences of joined  
> lines), you might be better off doing a plot "with vectors".
>
> Or you could transform your datafile into a massive list of 'set  
> arrow' commands and load that as a gnuplot script, then make a  
> dummy plot to display them.  Each arrow even gets to have its own  
> width.

Re: [Gnuplot-info] Getting more plots on one!

[Trillianx <ro...@ph...>]

Hello Thomas, 

Thanks for your script. It worked wonderfully. The final thing I need is to
change the xtics to alphabets. For this beside xtics in the" first plot from
bottom", I type the following: 

set xtics ("M5.0" 1.00000, "M6.0" 2.00000, "M7.0" 3.0, "M8.0" 4.0, "M9.0"
5.0) 

However when I do that the formatting changes again as you can see from the
screenshot. The set x2tics works well but not the xtics. Why is that? And
how can you rectify it? Here is the code again: 


reset
#set terminal postscript eps monochrome "Times-Roman" 10
#set output "data.eps" 
#set size 1.4,1.4
##----Setting small tics
set mytics
set mxtics
unset key

##--Setting y-range for all plots
#set yrange[0.5:7]
set xrange[0:6]

## Setting ylabels for all plots
set ylabel "EW (A)"

##Defining variables
SX = 0.5; SY = 0.2
OX = 0.05; OY = 0.05
NX = 1; NY = 3
#set ytics 0.0,2,7
set xtics 0.0,1,6
## define and then unset x2tics for later use
set x2tics 0.0,1,6
unset x2tics
PY = 0.198

##Setting margins
set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
set size SX*NX+OX*1.5, SY*NY+OY*1.8

## reserve some space for x- and y-labels by shifting
## the plots a little bit
OX=1.7*OX
OY=1.5*OY

set multiplot
## First plot from bottom------------------------------------
set size SX,SY
set origin OX,OY
set xtics
set xtics ("M5.0" 1.00000, "M6.0" 2.00000, "M7.0" 3.0, "M8.0" 4.0, "M9.0"
5.0)
set ytics 0.0,2,7
set yrange[0.5:7]
set xlabel "Spectral Type"
plot "order65.dat" 

## Second plot from bottom------------------------------------
set origin OX,PY+OY
unset xlabel
set yrange[0.5:10]
set ytics 0.0,2,10
set xtics format ""
plot "order65_2.dat"

## Third plot from bottom-------------------------------------
set origin OX,PY*2 + OY
set yrange[0:6]
set ytics 0.0,2,6
plot "order61.dat"

## Fourth plot from bottom------------------------------------
set origin OX,PY*3 + OY
## switch x2tics on
set x2tics ("M5.0" 1.00000, "M6.0" 2.00000, "M7.0" 3.0, "M8.0" 4.0, "M9.0"
5.0)
set yrange[0.5:5]
set ytics 0.0,2,5
plot "order61_2.dat"
unset multiplot 


http://old.nabble.com/file/p26363853/screen-capture.jpg 


Thomas Sefzick wrote:
> 
> have a look at this script:
> 
> reset
> 
> ##----Setting small tics
> set mytics
> set mxtics
> unset key
> 
> ##--Setting y-range for all plots
> set yrange[0:1]
> 
> ## Setting ylabels for all plots
> set ylabel "EW (A)"
> 
> ##Defining variables
> SX = 0.9; SY = 0.2
> OX = 0.05; OY = 0.05
> NX = 1; NY = 3
> set ytics -0.6,0.2,0.8
> set xtics -10.0,2,10
> ## define and then unset x2tics for later use
> set x2tics -10.0,2,10
> unset x2tics
> PY = 0.198
> 
> ##Setting margins
> set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
> set size SX*NX+OX*1.5, SY*NY+OY*1.8
> 
> ## reserve some space for x- and y-labels by shifting
> ## the plots a little bit
> OX=1.7*OX
> OY=1.5*OY
> 
> set multiplot
> ## First plot from bottom------------------------------------
> set size SX,SY
> set origin OX,OY
> set xtics
> set xlabel "Spectral Type"
> plot sin(x)
> 
> ## Second plot from bottom------------------------------------
> set origin OX,PY+OY
> unset xlabel
> set xtics format ""
> plot cos(x)
> 
> ## Third plot from bottom-------------------------------------
> set origin OX,PY*2 + OY
> plot tan(x)
> 
> ## Fourth plot from bottom------------------------------------
> set origin OX,PY*3 + OY
> ## switch x2tics on
> set x2tics
> plot sin(x)*exp(x)
> unset multiplot
> 
> 
> Trillianx wrote:
>> 
>> Sorry, in my previous post I am able to get solutions for question (1)
>> and (2). However I cannot find an answer to Question (3). Thus please
>> ONLY address question (3). Which is: 
>> 
>> 3. I would like to have the xtics to appear for all plots but the numbers
>> ONLY for the bottom plot. How do I make it happen? 
>> 
>> Thanks! 
>> 
>> Trillian. 
>> 
>> 
>> Trillianx wrote:
>>> 
>>> I have been using the multiplot function in gnuplot to recreate the plot
>>> from my first post. I am using gnuplot 4-2.5, However I have few
>>> problems ( Please scroll down to see the attached plot. 
>>> 
>>> 1. The ylabel does not work for all plots. Where should I position the
>>> ylabel? 
>>> 2. I would like to have the xlabel ONLY for the bottom plot. Where do I
>>> place the xlabel? Positioning as you can see in the code does not work. 
>>> 3. I would like to have the xtics to appear for all plots but the
>>> numbers ONLY for the bottom plot. How do I make it happen? 
>>> 
>>> ##----Setting small tics
>>> set mytics
>>> set mxtics
>>> unset key
>>> 
>>> ##--Setting y-range for all plots
>>> set yrange[0:1]
>>> 
>>> ## Setting ylabels for all plots
>>> set ylabel "EW (A)"
>>> 
>>> ##Defining variables
>>> SX = 0.9; SY = 0.2
>>> OX = 0.05; OY = 0.05
>>> NX = 1; NY = 3
>>> set ytic -0.6,0.2,0.8
>>> set xtic -10.0,2,10
>>> PY = 0.198
>>> 
>>> ##Setting margins 
>>> set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
>>> set size SX*NX+OX*1.5, SY*NY+OY*1.8
>>> 
>>> set multiplot
>>> ## First plot from bottom------------------------------------
>>> set size SX,SY
>>> set origin OX,OY
>>> set xtics
>>> set xlabel "Spectral Type" 
>>> plot sin(x)
>>> 
>>> ## Second plot from bottom------------------------------------
>>> set origin OX,PY+OY
>>> unset xlabel
>>> unset xtics
>>> plot cos(x)
>>> 
>>> ## Third plot from bottom-------------------------------------
>>> set origin OX,PY*2 + OY
>>> plot tan(x)
>>> 
>>> ## Fourth plot from bottom------------------------------------
>>> set origin OX,PY*3 + OY
>>> plot sin(x)*exp(x)
>>> unset multiplot
>>> 
>>> Thank you so much!! 
>>> 
>>> Rohit 
>>> 
>>>  http://old.nabble.com/file/p26351939/screen-capture-1.jpg 
>>> 
>>> Trillianx wrote:
>>>> 
>>>> I am not sure how to describe this but I would like to create plots
>>>> that look like those in the attached figure. How do you create these?
>>>> Please note that this is just on plot with many subplots. 
>>>> 
>>>> I know the basics of GNUPLOT but I am not sure how to put the plots
>>>> together as shown in the attached figure. So please just tell me how to
>>>> stack them one top of the other. 
>>>> 
>>>> Thank you so much !!
>>>>  http://old.nabble.com/file/p26230858/screen-capture-1.jpg 
>>>> 
>>>> 
>>> 
>>> 
>> 
>> 
> 
> 

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Re: [Gnuplot-info] strange behavior on calling gnuplot from cgi script written in python

[Steve C. <sc...@ja...>]

Here's the error:

 [error] [client ::1] malformed header from script. Bad header=\x89PNG:
usage_graph.cgi

I don't understand this.  How could closing the gnuplot process create a
malformed header yet leaving it open produces usable output?  Still, I
guess that's a clue.  I just don't know what it means.

Here is the guts of the script, deliberately leaving out details:

#!/usr/bin/python

import cgi
import MySQLdb
import os

parms = cgi.FieldStorage()

print "Content-Type: image/png"     # This is an image
print                               # blank line, end of headers


# open database connection
...
# create a cursor
cursor = db.cursor()

# execute SQL query
cursor.execute(query % (userid))

# get the resultset as a tuple
result = cursor.fetchall()
...
# open gnuplot process
gp = os.popen("/usr/bin/gnuplot, 'w')

# initialize the plot with desired settings including definition of
# "weekday" function.
...

# send plot command to gnuplot process
gp.write("""plot '-' u 1:(weekday(timecolumn(1)) ? column(2) : 0/0) ti
"Weekday" w impulses,  \
     ''  u 1:(weekday(timecolumn(1)) ? column(2) : 0/0) ti "Weekend" w
impulses\n""")

# send data to the plot command
for record in result:
    gp.write("%s %2.3f %d\n" % record)
gp.write("e\n")

#bombs out if following is uncommented.
#gp.close()

Again, I can't see anything here that would work if the gnuplot process
was left open but fail if it is closed.


Thomas Sefzick wrote:

> there should be information about what caused the error in
> the error-log of the http-server.
> 
> 
> stevecoh1 wrote:
>> Am trying to use gnuplot as a subprocess to a CGI script written in
>> python (similar to the perl script on p. 241 of "Gnuplot in Action").
>>
>> The python script itself follows the pattern of the python script on
>> p.230-231, that is
>>
>> gp = os.popen( ' /usr/bin/gnuplot', 'w')
>> ... plotting commands
>> gp.close()
>>
>> The cgi script produces a 500 error.
>>
>> But, if I comment out the gp.close() command, it works perfectly, and
>> produces the graph I want.  What is going on here?
>>
>>
>>
>>
>>
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>> 30-Day 
>> trial. Simplify your report design, integration and deployment - and focus
>> on 
>> what you do best, core application coding. Discover what's new with
>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>> _______________________________________________
>> Gnuplot-info mailing list
>> Gnu...@li...
>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>>
> 

Re: [Gnuplot-info] strange behavior on calling gnuplot from cgi script written in python

[Thomas S. <t.s...@fz...>]

there should be information about what caused the error in
the error-log of the http-server.


stevecoh1 wrote:
> 
> Am trying to use gnuplot as a subprocess to a CGI script written in
> python (similar to the perl script on p. 241 of "Gnuplot in Action").
> 
> The python script itself follows the pattern of the python script on
> p.230-231, that is
> 
> gp = os.popen( ' /usr/bin/gnuplot', 'w')
> ... plotting commands
> gp.close()
> 
> The cgi script produces a 500 error.
> 
> But, if I comment out the gp.close() command, it works perfectly, and
> produces the graph I want.  What is going on here?
> 
> 
> 
> 
> 
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
> 30-Day 
> trial. Simplify your report design, integration and deployment - and focus
> on 
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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[Gnuplot-info] strange behavior on calling gnuplot from cgi script written in python

[Steve C. <sc...@ja...>]

Am trying to use gnuplot as a subprocess to a CGI script written in
python (similar to the perl script on p. 241 of "Gnuplot in Action").

The python script itself follows the pattern of the python script on
p.230-231, that is

gp = os.popen( ' /usr/bin/gnuplot', 'w')
... plotting commands
gp.close()

The cgi script produces a 500 error.

But, if I comment out the gp.close() command, it works perfectly, and
produces the graph I want.  What is going on here?

Re: [Gnuplot-info] Getting more plots on one!

[Hans-Bernhard B. <HBB...@t-...>]

Trillianx wrote:

> 3. I would like to have the xtics to appear for all plots but the numbers
> ONLY for the bottom plot. How do I make it happen? 

Use a blank 'set format x' string for all but the bottom plots.

Re: [Gnuplot-info] ±

[Thomas S. <t.s...@fz...>]

gnuplot> set encoding iso_8859_1
and then it's
\261


Shk1234 wrote:
> 
> Hi,
> I am not sure how to give ± in gnuplot. Kindly help me out.
> Thanks in advance
> 

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Re: [Gnuplot-info] Month Year Axis Labels with minor ticks every Monday

[Thomas S. <t.s...@fz...>]

- use xtics for month tics
- use no mxtics
- make x2range the same as xrange
- scale x2tics to 0.5, mirror them, without labels (format "")
- use no mx2tics

e.g.:
set xdata time
set x2data time
set timefmt "%d.%m.%Y"
set xrange ["31.12.2009":"01.03.2010"]
set x2range ["31.12.2009":"01.03.2010"]
unset mxtics
unset mx2tics
set xtics 60*60*24*30 ; # seconds per month
set x2tics mirror scale 0.5 "03.01.2010",60*60*24*7 format ""
plot "datafilename" using 1:2

the xtics are used to show the months; x2tics show the mondays,
for this you need to specify the first monday and the interval
(seconds per 7 days).


stevecoh1 wrote:
> 
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Is this possible? I want to clearly show daily statistics over a year's
> time but break it up by weeks.
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.9 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org
> 
> iEYEARECAAYFAkr9nkcACgkQqyrAd6c4ARPx0ACfbpURc7n4wuwGS8CQeuyacfnc
> 5Y4An3U/c1SWMu7KnhoeXPNz7wJ9iq4D
> =4Szm
> -----END PGP SIGNATURE-----
> 
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
> 30-Day 
> trial. Simplify your report design, integration and deployment - and focus
> on 
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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Re: [Gnuplot-info] Getting more plots on one!

[Thomas S. <t.s...@fz...>]

have a look at this script:

reset

##----Setting small tics
set mytics
set mxtics
unset key

##--Setting y-range for all plots
set yrange[0:1]

## Setting ylabels for all plots
set ylabel "EW (A)"

##Defining variables
SX = 0.9; SY = 0.2
OX = 0.05; OY = 0.05
NX = 1; NY = 3
set ytics -0.6,0.2,0.8
set xtics -10.0,2,10
## define and then unset x2tics for later use
set x2tics -10.0,2,10
unset x2tics
PY = 0.198

##Setting margins
set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
set size SX*NX+OX*1.5, SY*NY+OY*1.8

## reserve some space for x- and y-labels by shifting
## the plots a little bit
OX=1.7*OX
OY=1.5*OY

set multiplot
## First plot from bottom------------------------------------
set size SX,SY
set origin OX,OY
set xtics
set xlabel "Spectral Type"
plot sin(x)

## Second plot from bottom------------------------------------
set origin OX,PY+OY
unset xlabel
set xtics format ""
plot cos(x)

## Third plot from bottom-------------------------------------
set origin OX,PY*2 + OY
plot tan(x)

## Fourth plot from bottom------------------------------------
set origin OX,PY*3 + OY
## switch x2tics on
set x2tics
plot sin(x)*exp(x)
unset multiplot


Trillianx wrote:
> 
> Sorry, in my previous post I am able to get solutions for question (1) and
> (2). However I cannot find an answer to Question (3). Thus please ONLY
> address question (3). Which is: 
> 
> 3. I would like to have the xtics to appear for all plots but the numbers
> ONLY for the bottom plot. How do I make it happen? 
> 
> Thanks! 
> 
> Trillian. 
> 
> 
> Trillianx wrote:
>> 
>> I have been using the multiplot function in gnuplot to recreate the plot
>> from my first post. I am using gnuplot 4-2.5, However I have few problems
>> ( Please scroll down to see the attached plot. 
>> 
>> 1. The ylabel does not work for all plots. Where should I position the
>> ylabel? 
>> 2. I would like to have the xlabel ONLY for the bottom plot. Where do I
>> place the xlabel? Positioning as you can see in the code does not work. 
>> 3. I would like to have the xtics to appear for all plots but the numbers
>> ONLY for the bottom plot. How do I make it happen? 
>> 
>> ##----Setting small tics
>> set mytics
>> set mxtics
>> unset key
>> 
>> ##--Setting y-range for all plots
>> set yrange[0:1]
>> 
>> ## Setting ylabels for all plots
>> set ylabel "EW (A)"
>> 
>> ##Defining variables
>> SX = 0.9; SY = 0.2
>> OX = 0.05; OY = 0.05
>> NX = 1; NY = 3
>> set ytic -0.6,0.2,0.8
>> set xtic -10.0,2,10
>> PY = 0.198
>> 
>> ##Setting margins 
>> set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
>> set size SX*NX+OX*1.5, SY*NY+OY*1.8
>> 
>> set multiplot
>> ## First plot from bottom------------------------------------
>> set size SX,SY
>> set origin OX,OY
>> set xtics
>> set xlabel "Spectral Type" 
>> plot sin(x)
>> 
>> ## Second plot from bottom------------------------------------
>> set origin OX,PY+OY
>> unset xlabel
>> unset xtics
>> plot cos(x)
>> 
>> ## Third plot from bottom-------------------------------------
>> set origin OX,PY*2 + OY
>> plot tan(x)
>> 
>> ## Fourth plot from bottom------------------------------------
>> set origin OX,PY*3 + OY
>> plot sin(x)*exp(x)
>> unset multiplot
>> 
>> Thank you so much!! 
>> 
>> Rohit 
>> 
>>  http://old.nabble.com/file/p26351939/screen-capture-1.jpg 
>> 
>> Trillianx wrote:
>>> 
>>> I am not sure how to describe this but I would like to create plots that
>>> look like those in the attached figure. How do you create these? Please
>>> note that this is just on plot with many subplots. 
>>> 
>>> I know the basics of GNUPLOT but I am not sure how to put the plots
>>> together as shown in the attached figure. So please just tell me how to
>>> stack them one top of the other. 
>>> 
>>> Thank you so much !!
>>>  http://old.nabble.com/file/p26230858/screen-capture-1.jpg 
>>> 
>>> 
>> 
>> 
> 
> 

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Re: [Gnuplot-info] Getting more plots on one!

[Trillianx <ro...@ph...>]

Sorry, in my previous post I am able to get solutions for question (1) and
(2). However I cannot find an answer to Question (3). Thus please ONLY
address question (3). Which is: 

3. I would like to have the xtics to appear for all plots but the numbers
ONLY for the bottom plot. How do I make it happen? 

Thanks! 

Trillian. 


Trillianx wrote:
> 
> I have been using the multiplot function in gnuplot to recreate the plot
> from my first post. I am using gnuplot 4-2.5, However I have few problems
> ( Please scroll down to see the attached plot. 
> 
> 1. The ylabel does not work for all plots. Where should I position the
> ylabel? 
> 2. I would like to have the xlabel ONLY for the bottom plot. Where do I
> place the xlabel? Positioning as you can see in the code does not work. 
> 3. I would like to have the xtics to appear for all plots but the numbers
> ONLY for the bottom plot. How do I make it happen? 
> 
> ##----Setting small tics
> set mytics
> set mxtics
> unset key
> 
> ##--Setting y-range for all plots
> set yrange[0:1]
> 
> ## Setting ylabels for all plots
> set ylabel "EW (A)"
> 
> ##Defining variables
> SX = 0.9; SY = 0.2
> OX = 0.05; OY = 0.05
> NX = 1; NY = 3
> set ytic -0.6,0.2,0.8
> set xtic -10.0,2,10
> PY = 0.198
> 
> ##Setting margins 
> set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
> set size SX*NX+OX*1.5, SY*NY+OY*1.8
> 
> set multiplot
> ## First plot from bottom------------------------------------
> set size SX,SY
> set origin OX,OY
> set xtics
> set xlabel "Spectral Type" 
> plot sin(x)
> 
> ## Second plot from bottom------------------------------------
> set origin OX,PY+OY
> unset xlabel
> unset xtics
> plot cos(x)
> 
> ## Third plot from bottom-------------------------------------
> set origin OX,PY*2 + OY
> plot tan(x)
> 
> ## Fourth plot from bottom------------------------------------
> set origin OX,PY*3 + OY
> plot sin(x)*exp(x)
> unset multiplot
> 
> Thank you so much!! 
> 
> Rohit 
> 
>  http://old.nabble.com/file/p26351939/screen-capture-1.jpg 
> 
> Trillianx wrote:
>> 
>> I am not sure how to describe this but I would like to create plots that
>> look like those in the attached figure. How do you create these? Please
>> note that this is just on plot with many subplots. 
>> 
>> I know the basics of GNUPLOT but I am not sure how to put the plots
>> together as shown in the attached figure. So please just tell me how to
>> stack them one top of the other. 
>> 
>> Thank you so much !!
>>  http://old.nabble.com/file/p26230858/screen-capture-1.jpg 
>> 
>> 
> 
> 

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Re: [Gnuplot-info] Getting more plots on one!

[Trillianx <ro...@ph...>]

I have been using the multiplot function in gnuplot to recreate the plot from
my first post. I am using gnuplot 4-2.5, However I have few problems (
Please scroll down to see the attached plot. 

1. The ylabel does not work for all plots. Where should I position the
ylabel? 
2. I would like to have the xlabel ONLY for the bottom plot. Where do I
place the xlabel? Positioning as you can see in the code does not work. 
3. I would like to have the xtics to appear for all plots but the numbers
ONLY for the bottom plot. How do I make it happen? 

##----Setting small tics
set mytics
set mxtics
unset key

##--Setting y-range for all plots
set yrange[0:1]

## Setting ylabels for all plots
set ylabel "EW (A)"

##Defining variables
SX = 0.9; SY = 0.2
OX = 0.05; OY = 0.05
NX = 1; NY = 3
set ytic -0.6,0.2,0.8
set xtic -10.0,2,10
PY = 0.198

##Setting margins 
set bmargin OX; set tmargin OX; set lmargin OY; set rmargin OY
set size SX*NX+OX*1.5, SY*NY+OY*1.8

set multiplot
## First plot from bottom------------------------------------
set size SX,SY
set origin OX,OY
set xtics
set xlabel "Spectral Type" 
plot sin(x)

## Second plot from bottom------------------------------------
set origin OX,PY+OY
unset xlabel
unset xtics
plot cos(x)

## Third plot from bottom-------------------------------------
set origin OX,PY*2 + OY
plot tan(x)

## Fourth plot from bottom------------------------------------
set origin OX,PY*3 + OY
plot sin(x)*exp(x)
unset multiplot

Thank you so much!! 

Rohit 

http://old.nabble.com/file/p26351939/screen-capture-1.jpg 

Trillianx wrote:
> 
> I am not sure how to describe this but I would like to create plots that
> look like those in the attached figure. How do you create these? Please
> note that this is just on plot with many subplots. 
> 
> I know the basics of GNUPLOT but I am not sure how to put the plots
> together as shown in the attached figure. So please just tell me how to
> stack them one top of the other. 
> 
> Thank you so much !!
>  http://old.nabble.com/file/p26230858/screen-capture-1.jpg 
> 
> 

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Re: [Gnuplot-info] gnuplot on Ubuntu Linux

[Trillianx <ro...@ph...>]

Follow the instruction suggested by Thomas. 

Once you have the untar the .gz file. Do the following: 

1. cd into gnuplot 
2. sudo ./configure 
3. wait till you get the prompt. 
4. sudo ./install.sh
5.Again wait and you should see gnplot 4-2.6 




Samster wrote:
> 
> How can I install gnuplot 4.2.6 on Ubuntu Linux 9.04? I am new to Ubuntu
> and gnuplot.
> 

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[Gnuplot-info] Month Year Axis Labels with minor ticks every Monday

[Steve C. <sc...@ja...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Is this possible? I want to clearly show daily statistics over a year's
time but break it up by weeks.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.9 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iEYEARECAAYFAkr9nkcACgkQqyrAd6c4ARPx0ACfbpURc7n4wuwGS8CQeuyacfnc
5Y4An3U/c1SWMu7KnhoeXPNz7wJ9iq4D
=4Szm
-----END PGP SIGNATURE-----

Re: [Gnuplot-info] Plotting boxes from origin other than 0

[Steven M. <smi...@gm...>]

Thomas,

It sometimes helps to be thinking in a different box.

Thanks!
Steve

On Tue, Nov 10, 2009 at 4:29 PM, Thomas Sefzick <t.s...@fz...> wrote:
>
> use y-axis for the scale, y2-axis for plotting:
> (assumption: your data goes from -110 up to e.g. -50)
>
> set yrange [-110:-50]
> set y2range [0:60]
> plot 'datafilename' using 1:($2+110) axes x1y2 with boxes
>
>
> Steven Michalske wrote:
>>
>> I want to plot barcharts and histograms from a different reference
>> other than y=0
>>
>>
>> For example, I want the box to start at -110 and go to -90
>>
>> Currently I do this by a lot of math and shifting the y labels and
>> data externally, but I feel that this is overlooking a simpler way.
>> That is I add 110 to all y values, then make a fake y label that has
>> -110 at the real 0
>>
>> Can I do this without all the external processing?
>>
>> Steve
>>
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>> 30-Day
>> trial. Simplify your report design, integration and deployment - and focus
>> on
>> what you do best, core application coding. Discover what's new with
>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>> _______________________________________________
>> Gnuplot-info mailing list
>> Gnu...@li...
>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>>
>
> --
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>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Gnuplot-info mailing list
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> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>

Re: [Gnuplot-info] Coloring surfaces between contour lines

[<mg...@fi...>]

> define a color palette with color steps instead of a gradient, e.g.:

Thanks for your answer! Unfortunately, this is not what I mean. Your
solution would lead to something like this image:
http://img503.imageshack.us/img503/1726/example2v.png

Of course, I only tried your solution for three colors like in your
example but this only seems to affect the pm3d map. I really want a result
like in this image: http://img503.imageshack.us/img503/5128/example3x.png

(I only filled in two surfaces, but the general idea should be clear from
this)

I really don't know if this is possible at all, but if someone knows,
please let me know.

>
> set palette model RGB defined (0 "green", 1 "green", 1 "yellow", 2
> "yellow",
> 2 "red", 3 "red" )
> test palette
>
> or
>
> set palette model RGB defined (0 "green", 1 "yellow", 2 "red")
> set palette maxcolors 3
> test palette
>
>
> mgraat wrote:
>>
>> Hello all,
>>
>> I am trying to find a way to color the surfaces between contourlines. I
>> have already plotted the contourlines (see
>> http://img262.imageshack.us/img262/40/exampleq.png), but cannot find a
>> way
>> to color the surfaces between them. For instance, if you look at the
>> example picture, the areas which are bordered by the lightblue lines
>> should have one color, those by the purple another, etc.
>>
>> For reference, I created the contour lines as follows:
>>
>> set pm3d map
>> set nosurface
>> set cntrparam bspline
>> set contour
>> set xrange [1:3.64]
>> set yrange [0.09:0.96]
>> unset colorbox
>> unset key
>> splot "results.dat" using ($5):($6):($1) notitle
>>
>> The results.dat file is basically build up like this (colom 5 and 6 are
>> X
>> and Y, 1 is Z):
>>
>> 85.45 1 1.2904819 0.7095181 1.01 0.1
>> 85.68 1 1.2904819 0.7095181 1.01 0.17782794
>> *snip*
>>
>> 86.61 1 1.2904819 0.7095181 1.0150374 0.1
>> 85.06 1 1.2904819 0.7095181 1.0150374 0.17782794
>> *snip*
>>
>> etc.
>>
>> Is this in any way possible, or should I just post-process the image in
>> a
>> program like GIMP?
>>
>> NB: pm3d map uses a gradient, which is not what I want.
>>
>> Kind regards,
>>
>> Michiel
>>
>>
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
>> 30-Day
>> trial. Simplify your report design, integration and deployment - and
>> focus
>> on
>> what you do best, core application coding. Discover what's new with
>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>> _______________________________________________
>> Gnuplot-info mailing list
>> Gnu...@li...
>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>>
>
> --
> View this message in context:
> http://old.nabble.com/Coloring-surfaces-between-contour-lines-tp26285045p26285730.html
> Sent from the Gnuplot - User mailing list archive at Nabble.com.
>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
> 30-Day
> trial. Simplify your report design, integration and deployment - and focus
> on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
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Re: [Gnuplot-info] Coloring surfaces between contour lines

[Thomas S. <t.s...@fz...>]

define a color palette with color steps instead of a gradient, e.g.:

set palette model RGB defined (0 "green", 1 "green", 1 "yellow", 2 "yellow",
2 "red", 3 "red" )
test palette

or

set palette model RGB defined (0 "green", 1 "yellow", 2 "red")
set palette maxcolors 3
test palette


mgraat wrote:
> 
> Hello all,
> 
> I am trying to find a way to color the surfaces between contourlines. I
> have already plotted the contourlines (see
> http://img262.imageshack.us/img262/40/exampleq.png), but cannot find a way
> to color the surfaces between them. For instance, if you look at the
> example picture, the areas which are bordered by the lightblue lines
> should have one color, those by the purple another, etc.
> 
> For reference, I created the contour lines as follows:
> 
> set pm3d map
> set nosurface
> set cntrparam bspline
> set contour
> set xrange [1:3.64]
> set yrange [0.09:0.96]
> unset colorbox
> unset key
> splot "results.dat" using ($5):($6):($1) notitle
> 
> The results.dat file is basically build up like this (colom 5 and 6 are X
> and Y, 1 is Z):
> 
> 85.45 1 1.2904819 0.7095181 1.01 0.1
> 85.68 1 1.2904819 0.7095181 1.01 0.17782794
> *snip*
> 
> 86.61 1 1.2904819 0.7095181 1.0150374 0.1
> 85.06 1 1.2904819 0.7095181 1.0150374 0.17782794
> *snip*
> 
> etc.
> 
> Is this in any way possible, or should I just post-process the image in a
> program like GIMP?
> 
> NB: pm3d map uses a gradient, which is not what I want.
> 
> Kind regards,
> 
> Michiel
> 
> 
> ------------------------------------------------------------------------------
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> 

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[Gnuplot-info] Coloring surfaces between contour lines

[<mg...@fi...>]

Hello all,

I am trying to find a way to color the surfaces between contourlines. I
have already plotted the contourlines (see
http://img262.imageshack.us/img262/40/exampleq.png), but cannot find a way
to color the surfaces between them. For instance, if you look at the
example picture, the areas which are bordered by the lightblue lines
should have one color, those by the purple another, etc.

For reference, I created the contour lines as follows:

set pm3d map
set nosurface
set cntrparam bspline
set contour
set xrange [1:3.64]
set yrange [0.09:0.96]
unset colorbox
unset key
splot "results.dat" using ($5):($6):($1) notitle

The results.dat file is basically build up like this (colom 5 and 6 are X
and Y, 1 is Z):

85.45 1 1.2904819 0.7095181 1.01 0.1
85.68 1 1.2904819 0.7095181 1.01 0.17782794
*snip*

86.61 1 1.2904819 0.7095181 1.0150374 0.1
85.06 1 1.2904819 0.7095181 1.0150374 0.17782794
*snip*

etc.

Is this in any way possible, or should I just post-process the image in a
program like GIMP?

NB: pm3d map uses a gradient, which is not what I want.

Kind regards,

Michiel

[Gnuplot-info] mark-up data points

[Claremont <fab...@go...>]

Is it possible to mark-up data points in gnuplot? 

For example, can gnuplot display additional info (tags, labels) if I hover
over/klick on a data point?

Clare
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Re: [Gnuplot-info] Plotting boxes from origin other than 0

[Thomas S. <t.s...@fz...>]

use y-axis for the scale, y2-axis for plotting:
(assumption: your data goes from -110 up to e.g. -50)

set yrange [-110:-50]
set y2range [0:60]
plot 'datafilename' using 1:($2+110) axes x1y2 with boxes


Steven Michalske wrote:
> 
> I want to plot barcharts and histograms from a different reference
> other than y=0
> 
> 
> For example, I want the box to start at -110 and go to -90
> 
> Currently I do this by a lot of math and shifting the y labels and
> data externally, but I feel that this is overlooking a simpler way.
> That is I add 110 to all y values, then make a fake y label that has
> -110 at the real 0
> 
> Can I do this without all the external processing?
> 
> Steve
> 
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008
> 30-Day 
> trial. Simplify your report design, integration and deployment - and focus
> on 
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Gnuplot-info mailing list
> Gnu...@li...
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> 
> 

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[Gnuplot-info] Plotting boxes from origin other than 0

[Steven M. <smi...@gm...>]

I want to plot barcharts and histograms from a different reference
other than y=0


For example, I want the box to start at -110 and go to -90

Currently I do this by a lot of math and shifting the y labels and
data externally, but I feel that this is overlooking a simpler way.
That is I add 110 to all y values, then make a fake y label that has
-110 at the real 0

Can I do this without all the external processing?

Steve

Re: [Gnuplot-info] public transport plotting again

[Hans-Bernhard B. <HBB...@t-...>]

Wolf Drechsel wrote:
> Given is a list, each line is containing two sets of x-y-coordinates.  
> Each linie should produce one stroke in the plot, leading from  
> coordinate set 1 to coordinate set 2.

If all such lines are strictly single (no sequences of joined lines), 
you might be better off doing a plot "with vectors".

Or you could transform your datafile into a massive list of 'set arrow' 
commands and load that as a gnuplot script, then make a dummy plot to 
display them.  Each arrow even gets to have its own width.

Re: [Gnuplot-info] User defined functions and y-axis labels

[Hans-Bernhard B. <HBB...@t-...>]

Camilla Mont wrote:
> plot [0:200] [1.0*10**6:1.5*10**12] f(x), g(x)
> 
> However, whenever I try to plot the function f(x), I cannot see it in the
> graphing window.

The problem comes from your apparent aversion to usual notation for big 
numbers, i.e. from spelling out  1*10**12 when you should have just 
written 1e12.  The problem is that 10**12, as writtten, is an operation 
on integers, so it'll be evaluated in integers.  But 10**12 is quite 
certainly larger than all integers on your machine, so this doesn't do 
anywhere near what you think it should:

gnuplot> print 10**12
-727379968
gnuplot> print 1.0*10**12
-727379968.0
gnuplot> print 1*10.0**12
1000000000000.0

> set format y "10^{%L} , but then the labels become just 10^8, 10^9 and so
> forth. Is there a possibility that I could change this?

See "help format specifiers" about %l.