gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Shifting time with %s

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

gnuplot> plot 'first.dat' u 1:2, 'second.dat' u (timecolumn(1)-86400):2


Jose Maria Martin Olalla wrote:
> 
> Hi all.
> 
> I have two file data both comparing time (in %S, the epoch format) and
> another variable. They both span over consecutive 24h. Say, first goes
> from 2009/02/27 00:00:00 to 23:59:59, and the second form 2009/02/28
> 00:00:00 to 23:59:59. I wish to plot both on the same x-axis as if they
> had been on the same day... in order to say differences at the same hour
> on consecutive days.
> 
> I first assumed it would be possible to shift data by 86400 seconds (one
> day):
> 
> gnuplot> set xdata time
> gnuplot> set timefmt "%s"
> gnuplot> set format x "%H:%M"
> gnuplot> plot 'first.dat' u 1:2, 'second.dat' u ($1-86400):2
> 
> but it didn't work. Why? It seems it 86400 does not couple with the
> 1235717242 in the epoch.
> 
> I would appriciate any hint for solving this problem. As general as
> possible since I am trying to script them so it is not possible to have a
> look to the precises values of the epoch contained in the files. 
> 

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Re: [Gnuplot-info] Time format Illegal month

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

set xrange ["8501":"0612"]

see 'help set xrange':
... If the data are time/date, you must give the range as
a quoted string according to the `set timefmt` format. ...


pacomet wrote:
> 
> Hi Gnuplot users
> 
> This is my first approach to gnuplot and I'm having a problem with
> time formats. I'm trying to plot a temperature time series like  YYMM
> TEMP
> 
> 8501 13.0900002
> 8502 12.71
> 8503 12.71
> 8504 13.6199999
> 8505 16.6499996
> 8506 18.6499996
> 8507 23.0400009
> 8508 22.9799995
> 8509 22.5100002
> 8510 22.2099991
> 8511 15.79
> 8512 14.7399998
> 8601 13.4099998
> 8602 12.3599997
> 8603 12.8199997
> 8604 13.0500002
> 
> with this settings in my script
> 
>   set autoscale xfix
>   set xlabel "Year"
>   set xdata time
>   set format x "%Y"
>   set timefmt "%y%m"
>   set xrange ["01/1985":"12/2006"]
> 
> I always get an error message saying:
> 
> line 0 : Illegal month
> 
> I've searched through the web and found this error comes mostly from
> data but I think my data file is right.
> 
> Any help would be greatly appreciated, thanks in advance
> 

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Re: [Gnuplot-info] Gnuplot does not like my text files!!

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

thatartskid wrote:

> No, I actually have Gnuplot installed on my Mac, and Excel (Mac) was 
> installed on the same machine. The problem is, I have been given a lot 
> of Excel data (made on a mac though), that I want to import in Gnuplot. 
> How do you suggest I export it?

In whatever form your instance of gnuplot expects.  What form that is 
depends on what kind of gnuplot you're running.  AFAIK there are both 
Unix-ish ones and Mac-ish ones, which I suspect differ in their line 
break conventions.  Traditionally there were three major formats:

	LF only, on Unix
	CR only, on MacOS (traditional)
	CR+LF, on Microsoft platforms

Now MacOS X is supposed to be more Unix than traditional MacOS, 
including the line break convention --- I have no idea how they get that 
to work without running into walls like the one you encountered, every 
second step.  There have to be translation tools hidden somewhere in all 
that GUI atmosphere.


  I have the choice between : - UTF-16
> Unicode - Tab delimited text - Windows formatted text - MS-DOS formatted 
> text - Windows comma separated - MS-DOS comma separated Although none of 
> these seem very mac-ish, do they? Sorry for the silly questions, but I 
> am completely new in the unix world.

Re: [Gnuplot-info] Gnuplot does not like my text files!!

[thatartskid <sk...@wo...>]

No, I actually have Gnuplot installed on my Mac, and Excel (Mac) was
installed on the same machine.

The problem is, I have been given a lot of Excel data (made on a mac
though), that I want to import in Gnuplot. How do you suggest I export it?

I have the choice between :
- UTF-16 Unicode
- Tab delimited text
- Windows formatted text
- MS-DOS formatted text
- Windows comma separated
- MS-DOS comma separated

Although none of these seem very mac-ish, do they?

Sorry for the silly questions, but I am completely new in the unix world.



Hans-Bernhard Bröker-2 wrote:
> 
> 
> thatartskid wrote:
>> I am having serious trouble to make GNUplot load simple tab-spaced files
>> (exported from Excel MAC though)
> 
> That's your problem right there.  You incorrectly exported those files 
> from the Mac to some other platform.  Text files need special treatment 
> to work cross-platforms, to translate between linebreak conventions, if 
> nothing else.  How that special treatment is activated depends on the 
> particular export method.  If all else fails, you can always use 
> separate tools like 'recode' or 'tr'.
> 
> 

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Re: [Gnuplot-info] Gnuplot does not like my text files!!

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

thatartskid wrote:
> I am having serious trouble to make GNUplot load simple tab-spaced files
> (exported from Excel MAC though)

That's your problem right there.  You incorrectly exported those files 
from the Mac to some other platform.  Text files need special treatment 
to work cross-platforms, to translate between linebreak conventions, if 
nothing else.  How that special treatment is activated depends on the 
particular export method.  If all else fails, you can always use 
separate tools like 'recode' or 'tr'.

Re: [Gnuplot-info] All points x value undefined

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

Julien Derr wrote:
> Hi everyone,
> I am always annoyed by this error message. But this time it really  
> seems to me that everything is defined!

How can that be, given gnuplot quite clearly informed you of the opposite

>           warning: Skipping unreadable file "average.50.7.dat"

?  What exactly did you expect gnuplot to do with data it couldn't see?

Re: [Gnuplot-info] All points x value undefined

[Franco B. <fra...@gm...>]

On Mon, Feb 23, 2009 at 6:51 PM, Julien Derr <Jul...@da...> wrote:
> Hi everyone,
> I am always annoyed by this error message. But this time it really
> seems to me that everything is defined!
> if some one has an idea, that would save me!
> thanks a lot,

check the permissions of the file, the contents are right for me.

-- 
Franco Bagnoli <fra...@un...> <fra...@gm...>
Lab. Fisica dei Sistemi Complessi, Dip. Energetica & CSDC
Universita' di Firenze, via S. Marta, 3 I-50139 Firenze, Italy.
Tel. +39 0554796592, fax: +39 0554796342

[Gnuplot-info] All points x value undefined

[Julien D. <Jul...@da...>]

Hi everyone,
I am always annoyed by this error message. But this time it really  
seems to me that everything is defined!
if some one has an idea, that would save me!
thanks a lot,

Julien


gnuplot> set pm3d map
gnuplot> splot 'average.50.7.dat'
          warning: Skipping unreadable file "average.50.7.dat"
          warning: Axis range undefined due to improper data values.  
NaN? Inf?
                                  ^
          All points x value undefined



and here is the file average.50.7.dat:

0.500000 -7.000000 49
0.750000 -7.000000 0
1.000000 -7.000000 0
1.250000 -7.000000 194
1.500000 -7.000000 173
1.750000 -7.000000 0
2.000000 -7.000000 0
2.250000 -7.000000 0
2.500000 -7.000000 0

0.500000 -6.000000 27
0.750000 -6.000000 85
1.000000 -6.000000 0
1.250000 -6.000000 194
1.500000 -6.000000 169
1.750000 -6.000000 0
2.000000 -6.000000 0
2.250000 -6.000000 0
2.500000 -6.000000 0

0.500000 -5.000000 11
0.750000 -5.000000 27
1.000000 -5.000000 54
1.250000 -5.000000 97
1.500000 -5.000000 124
1.750000 -5.000000 0
2.000000 -5.000000 0
2.250000 -5.000000 0
2.500000 -5.000000 0

Re: [Gnuplot-info] Gnuplot does not like my text files!!

[markjoe <na...@ma...>]

Hi,

You don't have any decent newlines in your file (only ^M, apparently
that's not enough, at least in my linux version of gnuplot). A simple
change from \n to \r did the trick. Try to export it differently .
Also beware of +'s and spaces in file names. Or stick to your Mac,
there \n will probably work as it is the default eol character.

Mark

On Mon, Feb 23, 2009 at 3:01 PM, thatartskid <sk...@wo...> wrote:
>
> Hello all,
>
> I am having serious trouble to make GNUplot load simple tab-spaced files
> (exported from Excel MAC though)
>
> Here is the faulty dat file :
> http://www.nabble.com/file/p22161584/ITD%2BWN.dat ITD+WN.dat
>
> And here is the program to run it :
> http://www.nabble.com/file/p22161584/ITD%2BWN.plt ITD+WN.plt
>
> basically i just want to do
>
>>> load "ITD WN.plt"
>
> but i get a silly error : "Can't calculate splines, need at least 3 points"
>
> Thanks a lot for your help!
>
> Nicolas
>
> --
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>
>
> ------------------------------------------------------------------------------
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[Gnuplot-info] Gnuplot does not like my text files!!

[thatartskid <sk...@wo...>]

Hello all,

I am having serious trouble to make GNUplot load simple tab-spaced files
(exported from Excel MAC though)

Here is the faulty dat file :
http://www.nabble.com/file/p22161584/ITD%2BWN.dat ITD+WN.dat 

And here is the program to run it :
http://www.nabble.com/file/p22161584/ITD%2BWN.plt ITD+WN.plt 

basically i just want to do 

>> load "ITD WN.plt"

but i get a silly error : "Can't calculate splines, need at least 3 points"

Thanks a lot for your help!

Nicolas

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[Gnuplot-info] Change plot in windows term before saving to file?

[bigblop <fed...@ya...>]

I like to edit (rotate) my 3D splot in the windows term before I save them to
a file. But currently its only possible to choose "print..." from the option
menu (copy to clipboard does not give a good quality result). If I do this
and print to a pdf (Metafile to EPS converter) file I get a whole A4 page
instead of only the are with my plot.

How do I see and manipulate my plot interactively and then save only the
plot area to a file?
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[Gnuplot-info] Bold latex text?

[bigblop <fed...@ya...>]

I am trying to make a label bold, but it does not work if I use underscore:

set label "P_{11}" at 1,1,1+y_offset font "Helvetica Bold"

If I instead omit the undersocre (subscript) it works fine:

set label "P11"   at 1,1,1+y_offset font "Helvetica Bold"

Is it not possible to make text with latex subscripts bold? 
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Re: [Gnuplot-info] swf terminal

[Tai V. <ta...@ea...>]

On 19-Feb-09, at 4:39 AM, Tomas Ledvinka wrote:

> On Wed, Feb 18, 2009 at 10:01 PM, Franco Bagnoli
> <fra...@gm...> wrote:
>> I would like to develop a web interface to a program, and I need to
>> generate animations on the fly, using gnuplot.
>>
>> One possibility is to use animated gifs, but I think that a flash
>> (swf) format would be much better. Other possibilities?
>>
>> Do you know if someone has developed an swf terminal for gnuplot? Or:
>> is there anybody interested in it?
>
> Hi,
>
> I am also interested in swf terminal and found just one workaround:
>
>     http://www.swftools.org/png2swf.html
>
> Unfortunately, this simple tool does not provide swf with toolbar for
> pausing the playback, changing direction and speed etc., which could
> be useful for e.g. physics education animations.

I think you need an authoring package for SWF animations if you want  
to create proper animations with controls like that. But I am not a  
SWF developer so I could be wrong.

One problem with png2swf is that PNGs are bitmaps and SWF graphics  
are vector. So you might have better luck with SVG, a vector graphic  
standard. A tool or two exists for this (SVG to SWF) purpose  
(assuming SVGs don't directly serve you needs), with one example at

	http://gtrebaol.free.fr/doc/svgopen/2008/index.html

I've found the SVG terminal for Gnuplot is very impressive, and much  
better for web use than PS or PDF.

Regards,
tai


-- 
tai viinikka		
ta...@ea...		:: The dinosaurs are dying each day. 					

Re: [Gnuplot-info] swf terminal

[Tomas L. <led...@gm...>]

On Wed, Feb 18, 2009 at 10:01 PM, Franco Bagnoli
<fra...@gm...> wrote:
> I would like to develop a web interface to a program, and I need to
> generate animations on the fly, using gnuplot.
>
> One possibility is to use animated gifs, but I think that a flash
> (swf) format would be much better. Other possibilities?
>
> Do you know if someone has developed an swf terminal for gnuplot? Or:
> is there anybody interested in it?

Hi,

I am also interested in swf terminal and found just one workaround:

    http://www.swftools.org/png2swf.html

Unfortunately, this simple tool does not provide swf with toolbar for
pausing the playback, changing direction and speed etc., which could
be useful for e.g. physics education animations.

                  T.

[Gnuplot-info] gnuplot - fit - no. of decimal points

[peggyhyli <peg...@go...>]

I tried to do a fit with gnuplot as follows:

$gnuplot > fit a0+a1*(x)**(-2)+a2*(x)**(-4) "file.txt" via a0,a1,a2

and got the following results :

a0              = -0.552046      
a1              = 0.355          
a2              = -0.526979

Please advise how to get more decimal points for the results.  For example,
the number of decimal points I would like to have to a0 is 12 (i.e., 12
decimal points).
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[Gnuplot-info] swf terminal

[Franco B. <fra...@gm...>]

I would like to develop a web interface to a program, and I need to
generate animations on the fly, using gnuplot.

One possibility is to use animated gifs, but I think that a flash
(swf) format would be much better. Other possibilities?

Do you know if someone has developed an swf terminal for gnuplot? Or:
is there anybody interested in it?

-- 
Franco Bagnoli <fra...@un...> <fra...@gm...>
Lab. Fisica dei Sistemi Complessi, Dip. Energetica & CSDC
Universita' di Firenze, via S. Marta, 3 I-50139 Firenze, Italy.
Tel. +39 0554796592, fax: +39 0554796342

Re: [Gnuplot-info] "Holes" when using Smooth Bezier?

[Alexander S. <ale...@gm...>]

Hi.

On Mon, Feb 16, 2009 at 12:50, Thomas Sefzick <t.s...@fz...> wrote:
>
> omit the line
> 2009-02-05 04:31:00,0
> from your data:
>
> plot datafile using 1:($2 <= 0 ? 0/0 : ($2 > 10000 ? 10001 : $2)) smooth

Ah, so the 0 was causing problems.

Thanks a lot for your help, now there are no more "holes" in the graph.

Cheers,
Alexander
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Re: [Gnuplot-info] "Holes" when using Smooth Bezier?

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

omit the line
2009-02-05 04:31:00,0
from your data:

plot datafile using 1:($2 <= 0 ? 0/0 : ($2 > 10000 ? 10001 : $2)) smooth
bezier with lines title "Smooth Bezier, Capped", \
datafile using 1:($2 <= 0 ? 0/0 : $2) smooth bezier with lines title "Smooth
Bezier", \
datafile using 1:($2 > 10000 ? 10001 : $2) with lines title "Lines, Capped",
\
datafile using 1:2 with lines title "Lines", \
datafile using 1:2 with dots title "Dots"


Alexander Skwar-6 wrote:
> 
> Hi.
> 
> I'm using Gnuplot 4.2.4 and 4.3 CVS (~2009-02-03) to plot some data with
> the following plot command:
> 
> plot datafile using 1:($2 > 10000 ? 10001 : $2) smooth bezier with
> lines title "Smooth Bezier, Capped", \
>  datafile using 1:2 smooth bezier with lines title "Smooth Bezier", \
>  datafile using 1:($2 > 10000 ? 10001 : $2) with lines title "Lines,
> Capped", \
>  datafile using 1:2 with lines title "Lines", \
>  datafile using 1:2 with dots title "Dots"
> 
> Doing so, I noticed that there are "holes" in the curves when I use
> "smooth bezier".
> 
> Please see samples at (they all show the same data, just different
> formats):
> 
> http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.svg
> http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.png
> http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.svg.png
> 
> On
> http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.gnuplot
> you can find the complete gnuplot file and there's also the CSV datafile
> at
> http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.csv
> 
> The "hole" that I'm talking about is shown for the red curve (the 1st
> curve)
> at about 05.02.09 04:00 and ends at about 14:00. But as you can see in
> the datafile and also in the "curves" using dots or lines, there ARE
> datapoints
> available during that timeframe.
> 
> It, however, might be so, that indeed there are some tiny holes in the
> CSV file.
> But it's BY FAR not as big a hole as the smooth bezier curve makes it look
> like.
> 
> What is causing these holes in the display?
> 
> Thanks a lot,
> Alexander
> -- 
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> 
> ------------------------------------------------------------------------------
> Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco,
> CA
> -OSBC tackles the biggest issue in open source: Open Sourcing the
> Enterprise
> -Strategies to boost innovation and cut costs with open source
> participation
> -Receive a $600 discount off the registration fee with the source code:
> SFAD
> http://p.sf.net/sfu/XcvMzF8H
> _______________________________________________
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> 

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[Gnuplot-info] "Holes" when using Smooth Bezier?

[Alexander S. <ale...@gm...>]

Hi.

I'm using Gnuplot 4.2.4 and 4.3 CVS (~2009-02-03) to plot some data with
the following plot command:

plot datafile using 1:($2 > 10000 ? 10001 : $2) smooth bezier with
lines title "Smooth Bezier, Capped", \
 datafile using 1:2 smooth bezier with lines title "Smooth Bezier", \
 datafile using 1:($2 > 10000 ? 10001 : $2) with lines title "Lines, Capped", \
 datafile using 1:2 with lines title "Lines", \
 datafile using 1:2 with dots title "Dots"

Doing so, I noticed that there are "holes" in the curves when I use
"smooth bezier".

Please see samples at (they all show the same data, just different formats):

http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.svg
http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.png
http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.svg.png

On http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.gnuplot
you can find the complete gnuplot file and there's also the CSV datafile at
http://public-files.askwar.s3.amazonaws.com/gnuplot-bezier-hole/rpl.csv

The "hole" that I'm talking about is shown for the red curve (the 1st curve)
at about 05.02.09 04:00 and ends at about 14:00. But as you can see in
the datafile and also in the "curves" using dots or lines, there ARE datapoints
available during that timeframe.

It, however, might be so, that indeed there are some tiny holes in the
CSV file.
But it's BY FAR not as big a hole as the smooth bezier curve makes it look like.

What is causing these holes in the display?

Thanks a lot,
Alexander
-- 
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[ Mehr => http://zyb.com/alexws77 ]
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Re: [Gnuplot-info] Date handling in gnuplot

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

azzazzello wrote:

> When I mark my data as 'time' (xdata = 'time'), and my set has
> missing dates, gnuplot will automatically insert those missing dates.

Not really.  What gnuplot does is not insertion of anything that's 
missing.  You won't find any data points being plotted that weren't in 
your file lest you asked gnuplot to filter the data into a smooth function.

It's just plotting your data on the kind of scale you requested: 
time/date.  And whether you wanted it that way or not, time actually 
does have 7 days every week, and a little over 365 days every year.

> My intent, however, is to NOT have them at all.  Is there something I can do
> to tell it not to fill in missing dates?

If what you really wanted is to treat your data as points on a scale 
that doesn't actually display time, don't tell gnuplot you wanted time.

The "with xticlabels" option might be closer to what you want, then.

[Gnuplot-info] Date handling in gnuplot

[azzazzello <ise...@kn...>]

Greetings,

   I am using a Perl frontend to gnuplot, but still think the question would
be appropriate.  When I mark my data as 'time' (xdata = 'time'), and my set
has missing dates, gnuplot will automatically insert those missing dates. 
My intent, however, is to NOT have them at all.  Is there something I can do
to tell it not to fill in missing dates?
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Re: [Gnuplot-info] Coloring 2D data points - No palette interpolation

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

cbrange is mapped to the gray intervall from 0.0 to 1.0,
so the color functions work in this range.
to get higher z-values, define cbrange:

zmin=1.5
zmax=6.5
# a mapping function needed to calculate the color
zval(x)=(x-zmin)/(zmax-zmin)
#
set cbrange [zmin:zmax]
# color functions
green(x)=x<=zval(2.5)?1.0:(x>zval(4.5)&&x<=zval(5.5)?1.0:0.0)
red(x)=x>zval(2.5)&&x<=zval(3.5)?1.0:(x>zval(4.5)?1.0:0.0)
blue(x)=x>zval(3.5)&&x<=zval(4.5)?1.0:(x>zval(5.5)?1.0:0.0)
#
set palette functions red(gray),green(gray),blue(gray)
test palette
# an example plot
splot [0:4] [0:4] x+y with pm3d


ranlot wrote:
> 
> Really helpful.  How would you modify this piece of code to include colors
> for z values higher than 1.  For example:
> z = 2  --> green
> z = 3  --> red
> z = 4  --> blue
> z = 5  --> something else
> z = 6   --> yet even another color.
> 
> 
> Thomas Sefzick wrote:
>> 
>> 
>>     set palette functions 0,(gray>0.5?1.:0.),(gray<=0.5?1.:0.)
>> 
>> 
> 
> 

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[Gnuplot-info] -persist and mouse in 3D

[Tomas L. <led...@gm...>]

Dear gnuplot-info subscribers,

gnuplot -persist

command switch allows to leave open graphs even
after the calling application exits.

But I have problems in leaving the mouse "active" in 3D plots.
While 2D plot window created by command

    echo "set mouse;plot x;pause -1"|gnuplot -persist

works at least partially with mouse support, providing coordinate
read-out, its 3D couterpart

    echo "set mouse;splot x*y;pause -1"|gnuplot -persist

ignores attempts to use mouse for graph rotation etc.
Please, is there any --persist-with-3d-mouse-support option
or something similar ?

                          Thank you.
                            T. L.

Re: [Gnuplot-info] Coloring 2D data points - No palette interpolation

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

either define your own color palette, e.g.:
    set palette functions 0,(gray>0.5?1.:0.),(gray<=0.5?1.:0.)
or reduce the number of colors:
    set palette maxcolors 2

the actual palette can be viewed with
    test palette


ranlot wrote:
> 
> Imagine you have a file with 3 columns: x y z.  The goal is to make a 2d
> plot of x and y with a color according to the z value.  I've been able to
> do that with the 'set palette' command.  This always involves some
> interpolation in the color spectrum to make it continuous.
> Is it possible to keep a discrete set of colors instead?  (For example z =
> 0 would be blue and z = 1 would be green without some sort of
> interpolation)
> 

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Re: [Gnuplot-info] Ghost point on the output graph?

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

that's not a ghost point, it belongs to the key:
http://www.gnuplot.info/docs/node192.html


Kuang Chen wrote:
> 
> Hey:
> 
>        I found this really weird "ghost" point whenever I import and plot
> data from a text file, which is attached below. The command I entered is
> simply
> 
>        plot "data.txt" using 1:2
> 
>        Thanks,
> Kuang
> 
> 1 3
> 
> 
>  
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