gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Insert "created on" into plot

[Ethan M. <eam...@gm...>]

Another variant:

set label N at x,y   time("Created on %d-%m-%Y")



On Fri, Nov 8, 2013 at 2:51 PM, Theo <th...@gm...> wrote:

> you are looking for something like
>
> set label 1 "Created on\r\n".strftime("%d.%m.%Y\r\n%H:%M:%S",time(0)) at
> screen 0.8,0.2
>
> Check help and/or the pdf documentation about more details of time
> format, labels, coordinates etc.
>
>
>
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Re: [Gnuplot-info] Insert "created on" into plot

[Theo <th...@gm...>]

you are looking for something like

set label 1 "Created on\r\n".strftime("%d.%m.%Y\r\n%H:%M:%S",time(0)) at 
screen 0.8,0.2

Check help and/or the pdf documentation about more details of time 
format, labels, coordinates etc.

Re: [Gnuplot-info] Insert "created on" into plot

[Ethan M. <eam...@gm...>]

3 possibilities:

# automatic, but may not place it where you want
set timestamp

# create a label wherever you like
# see "help timefmt" for available format options
set label N at x, y strftime(time("%d/%m/%Y",0))

# same idea but use the output of a shell command
set label N at x, y system("date")



On Fri, Nov 8, 2013 at 2:34 PM, ge...@ri... <ge...@ri...> wrote:

> Hi all,
>
> I'm a quite new gnuplot user, and so far I'm really impressed and it
> works quite well.
>
> I would like to include a string like "created on date & time" into my
> plots. I've searched for a possibility to achieve this in the internet
> and the documentation, but without success so far, maybe I've used the
> wrong search termes. (Sorry if this sounds maybe like a dumb
> question...)
>
> Could anybody advise please?
>
> Thanks,
> Georg
>
>
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[Gnuplot-info] Insert "created on" into plot

[<ge...@ri...>]

Hi all,

I'm a quite new gnuplot user, and so far I'm really impressed and it
works quite well.

I would like to include a string like "created on date & time" into my
plots. I've searched for a possibility to achieve this in the internet
and the documentation, but without success so far, maybe I've used the
wrong search termes. (Sorry if this sounds maybe like a dumb
question...)

Could anybody advise please?

Thanks,
Georg

Re: [Gnuplot-info] plot dstat output cvs file

[Theo <th...@gm...>]

Hi Bart,

there is a solution :-)
Not very elegant but the result is important...
Basically, you are creating a few dummy plots thereby extracting the 
columnheaders into string variables.
Then you create your desired plot using those variables.

Let me know whether it also works for you.

Theo.


I used the reduced data "Bart.dat":


"Dstat 0.7.2 CSV output"
"Author:","Dag Wieers <da...@wi...>",,
"Host:","maverick",,
"Cmdline:","dstat -tv --output dstat_timed.csv",,

"system","procs",,
"time","run","blk","new"
30-10 11:19:41,0.000,0.0,1.284,729153536.0
30-10 11:19:42,0.0,0.0,0.0,729186304.0
30-10 11:19:43,0.0,0.0,1.0,729186304.0
30-10 11:19:44,0.0,0.0,1.0,729194496.0
30-10 11:19:45,0.0,0.0,17.0,730214400.0



set datafile separator ","

# extract the columheaders from block 1 and point 1
# and store them in variables
# this will create some warnings which can be ignored
plot "Bart.dat" u (TitleCol2=stringcolumn(2),1):0 every ::1:1:1:1
plot "Bart.dat" u (TitleCol3=stringcolumn(3),1):0 every ::1:1:1:1
plot "Bart.dat" u (TitleCol4=stringcolumn(4),1):0 every ::1:1:1:1

set xlabel "Time"
set xdata time
set timefmt "%d-%m %H:%M:%S"
set format x "%H:%M"
set xrange [*:*]

plot "Bart.dat" u 1:2 every ::2:1 w lp t TitleCol2, \
              '' u 1:3 every ::2:1 w lp t TitleCol3, \
		 '' u 1:4 every ::2:1 w lp t TitleCol4

Re: [Gnuplot-info] plot dstat output cvs file

[Bart V. <Bar...@te...>]

On 11/07/2013 08:39 PM, Theo wrote:
> Hi Bart,
>
> I read again the description of 'every' carefully (which I also
> recommend to you ;-).
> Obviously, empty lines in data rows seperate individual data blocks.
> So, if there is an empty line in your data it starts a new block.

True.  I was aware of that.  But indeed you are right, I should've read 
the description of 'every' more carefully :-)

> Let's use the simplified data:
>
> "blabla1",,,
> "blabla2",,,
> "blabla3",,,
> "blabla4",,,
>
> "blabla6",,,
> "date time","A","B","C"
> 30-10 11:19:40,1.0,2.0,3.0
> 30-10 11:19:41,1.1,2.1,3.1
> 30-10 11:19:42,1.2,2.2,3.2
> 30-10 11:19:43,1.3,2.3,3.3
> 30-10 11:19:44,1.4,2.4,3.4
>
> The command to plot this:
>
> plot 'Data.dat' u 1:2 every 1:1:2:1 w lp t "Title 2"    # and so on...
>      which is equivalent to
> plot 'Data.dat' u 1:2 every ::2:1 w lp t "Title 2"
>
> # explanation of every 1:1:2:1
> data points increment is 1
> block increment is 1
> starting point is 2 (points in each block start from 0)
> starting block is 1 (blocks start from 0)
>
> However, I have not found a way to automatically take the columnheaders
> from line 2 of block 1.
> gnuplot seems to always take line 0 from block 0.

Indeed.  And that is exactly still my annoying problem :-)  If anybody 
knows a way how to take the correct columnheaders, feel free to let me know!

Kind regards,
Bart

Re: [Gnuplot-info] Absolute cell referencing

[Theo <th...@gm...>]

As I understand and have read several times, gnuplot is not made for 
that. However, I'd also love to have this feature.

You can try the following:
Define variables for row and column

c=2  # column number
r=3  # row number-1
a=0  # will later contain your value

plot 'Data.dat' u 1:(a=column(c),1/0) every 1:1:r:0:r:0 notitle

You will get a warning and no plot.
However, if you type

show var

the variable a contains the desired value.

Maybe there is or will be a more elegant way to extract values of "cells".
Good luck,
Theo.

[Gnuplot-info] Absolute cell referencing

[smms <sm...@ho...>]

In excel absolute cell reference means you can refer to any desired cell. For
example, to refer to cell A1, one can use $a$1. Is there any equivalent way
to do the same in gnuplot? Thanks.



--
View this message in context: http://gnuplot.10905.n7.nabble.com/Absolute-cell-referencing-tp17819.html
Sent from the Gnuplot - User mailing list archive at Nabble.com.

Re: [Gnuplot-info] plot dstat output cvs file

[Theo <th...@gm...>]

Hi Bart,

I read again the description of 'every' carefully (which I also 
recommend to you ;-).
Obviously, empty lines in data rows seperate individual data blocks.
So, if there is an empty line in your data it starts a new block.

Let's use the simplified data:

"blabla1",,,
"blabla2",,,
"blabla3",,,
"blabla4",,,

"blabla6",,,
"date time","A","B","C"
30-10 11:19:40,1.0,2.0,3.0
30-10 11:19:41,1.1,2.1,3.1
30-10 11:19:42,1.2,2.2,3.2
30-10 11:19:43,1.3,2.3,3.3
30-10 11:19:44,1.4,2.4,3.4

The command to plot this:

plot 'Data.dat' u 1:2 every 1:1:2:1 w lp t "Title 2"    # and so on...
    which is equivalent to
plot 'Data.dat' u 1:2 every ::2:1 w lp t "Title 2"

# explanation of every 1:1:2:1
data points increment is 1
block increment is 1
starting point is 2 (points in each block start from 0)
starting block is 1 (blocks start from 0)

However, I have not found a way to automatically take the columnheaders 
from line 2 of block 1.
gnuplot seems to always take line 0 from block 0.

Re: [Gnuplot-info] plot dstat output cvs file

[Theo <th...@gm...>]

what happens if you additionally apply the following?

set datafile commentschar '"'

Then it seems to work even with the empty line.
However, you might have to skip the automatic columnheader() and set the 
title manually. Maybe there is still a way to extract the title 
automatically?!

plot "Data.dat" u 1:2 t "Title 2" w lp, "" using 1:3 t "Title 3" w lp, 
"" using 1:4 t "Title 4" w lp

Re: [Gnuplot-info] problem: 'unset key' and 'plot with image'

[Maximilian K. <Max...@fr...>]

Hi Theo

On 11/05/2013 10:54 AM, Theo wrote:
> Hi Max,
>
> could it be that instead of 'unset key' you are looking for 'unset 
> colorbox'?
Yes, that was the issue! I didn't realize this was different. Thanks a
lot for your help!

Max

Re: [Gnuplot-info] problem: 'unset key' and 'plot with image'

[Theo <th...@gm...>]

Hi Max,

could it be that instead of 'unset key' you are looking for 'unset 
colorbox'?

set colorbox
# set margins and ranges, etc.
plot 'Data.dat' u 1:2:3 with image

unset colorbox
# set margins and ranges, etc.
plot 'Data.dat' u 1:2:3 with image

You also might have to adjust the margins of one of the graphs.

Re: [Gnuplot-info] problem: 'unset key' and 'plot with image'

[Maximilian K. <Max...@fr...>]

Hi Theo,

> I am not sure, whether I understand your problem.

The aim I started out from is having a multiplot (two rows) and one  
key (of either of the plots, as they are from the same data) on the  
right handside spanning over the whole area.

considering I have another overlay and thus an additional key, this is  
not necessary any more: Instead of the layout described above, I'd  
like to have only one of the identical key set and the key of the  
overlay.

The problem (why I wrote to the list) is, I cannot unset any keys.

> If you want a key in the second plot you should apply
>
> set key
>
> before the second plot command.

True :P bad sample-code. I did this, but using data I was not able to  
unset any key at all (so in even in this code-snippet all keys were  
visible!).

> If I plot e.g. sin(x) and cos(x) I get the keys as expected.
> How does your data look like? Is it matrix data?

the data is read in from a file: It is a map of magnetic flux values  
for a cylindrical geometry

r z B_z R_r B_phi B_tot

> Do you have a reduced data example?

My reduces data-example is still over 1M, is it okay if I send it to  
y

Re: [Gnuplot-info] plot dstat output cvs file

[Bart V. <Bar...@te...>]

On 10/30/2013 10:06 PM, Theo wrote:
> your data looks a bit distorted (return/newlines), maybe it's because of
> the mail program.

True.

> If I correct this and apply all your settings and
>
> plot 'Data.csv' u 1:4 every ::6
>
> with gnuplot 4.6.3 I do not have problems.
>
> Do you get error messages? What is actually plotted?
> Maybe try first simpler data to find out what's going wrong.
>
> Theo.
>
> Can you plot e.g. this?
>
> "blabla1"
> "blabla2"
> "blabla3"
> "blabla4"
> "blabla5"
> "blabla6"
> 30-10 11:19:40,1.0,2.0,3.0
> 30-10 11:19:41,1.1,2.1,3.1
> 30-10 11:19:42,1.2,2.2,3.2
> 30-10 11:19:43,1.3,2.3,3.3
> 30-10 11:19:44,1.4,2.4,3.4

First of all, my version of gnuplot is gnuplot 4.6 patchlevel 3.

Secondly, If I plot the following data

"blabla1"
"blabla2"
"blabla3"
"blabla4"
"blabla5"
"blabla6"
"blabla7"
30-10 11:19:40,1.0,2.0,3.0
30-10 11:19:41,1.1,2.1,3.1
30-10 11:19:42,1.2,2.2,3.2
30-10 11:19:43,1.3,2.3,3.3
30-10 11:19:44,1.4,2.4,3.4

using the script

------ cut here -----------------------------------------------
set loadpath '../data'
set datafile separator ","

set xlabel "Time"
set xdata time
set timefmt "%d-%m %H:%M:%S"
set format x "%H:%M"

plot "dstat_test.csv" u 1:2 every ::6 t columnheader(2) w lp, \
      "" using 1:3 every ::6 t columnheader(3) w lp, \
      "" using 1:4 every ::6 t columnheader(4) w lp
------ cut here -----------------------------------------------

then I correctly get three straight lines.  If I however remove the line 
"blabla5" so that the data-file looks more like a dstat data output file:

"blabla1"
"blabla2"
"blabla3"
"blabla4"

"blabla6"
"blabla7"
30-10 11:19:40,1.0,2.0,3.0
30-10 11:19:41,1.1,2.1,3.1
30-10 11:19:42,1.2,2.2,3.2
30-10 11:19:43,1.3,2.3,3.3
30-10 11:19:44,1.4,2.4,3.4

and i use the same script for plotting, then the plot is wrong and I 
only see three dots plottet vertically above each other (at y-values 
1.5, 2.5 and 3.5).

So the empty line is causing me trouble here... but I don't know why :-(

Any help appreciated.

Kind regards,
Bart

Re: [Gnuplot-info] problem: 'unset key' and 'plot with image'

[Theo <th...@gm...>]

I am not sure, whether I understand your problem.
Before the first plot command you apply

unset key

If you want a key in the second plot you should apply

set key

before the second plot command.

If I plot e.g. sin(x) and cos(x) I get the keys as expected.
How does your data look like? Is it matrix data?
Do you have a reduced data example?

Theo.

[Gnuplot-info] smooth on subset of data

[Maximilian K. <Max...@fr...>]

Hi all,

this is my second post today - you can see I'm still starting off with
gnuplot :P

I have a large data-file, which contains my data, each point is a line
of the format (r z B_r B_z B_phi)

So, if I want to plot the values of B_z at a fixed r, I do something like
    plot 'PG.dat' using 2:( $1 == 0 ? $4 : 1/0 ) title 'B(z,r=0)'
which works nice. (I tried the index option, but I couldn't get it to work).

If I want a smooth line instead of points, I have to append 'smooth
unique', as far as I understand. With the method I used to indentify my
subset of points, this method doesent work (for splines it should be at
last 3 points, 'unique' doesn't plot anything (except for the key; there
a line is visible)).

Is there a way to get smooth lines? Or am I doing things wrong?

Best regards, Max

[Gnuplot-info] problem: 'unset key' and 'plot with image'

[Maximilian K. <Max...@fr...>]

Hi all,

I am trying to plot several graphs from the same data-file, which
contains data on a magnetic field. In the end I want a plot, where the
top part has the same settings as the lower one, except that the y-scale
is different.
To this end, I use a multiplot and align the two plots by
    set [t|b]margin at screen y
which works nicely. The problem is the key - I only want one, if
possible spanning the whole graph on the right side. At this point, I
can not even make the key disappear for one graph (I have already tried
"set key off", "unset key", "notitle")

I used the 'with image' keyword, but I think this is the part that
messes up the above.

This is the code I have so far:


#~~~ set multiplot ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
set multiplot layout 2,1 rowsfirst upwards
set xrange [-1.2:1.2]
set cbrange [0:.18]

#~~~ interesting part of coil no key ~~~~~~~~~~~~~~
set yrange [0:.05]
set tmargin at screen .4
unset key
plot 'PG.dat' using 2:1:6 notitle with image
#~~~ clear settings ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
unset tmargin

#~~~ rest of the coil with key ~~~~~~~~~~~~~~~~~~~~
unset xtics                             # no x-tics
set bmargin at screen .4                # specify x-start
set yrange [.05:.22]                    # set x-range
plot 'PG.dat' using 2:1:6 with image
#~~~ clear settings ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
unset bmargin

unset multiplot

Thanks for your help, Max

Re: [Gnuplot-info] drawing horizontal line

[Ethan A M. <eam...@gm...>]

On Sunday, 03 November 2013 09:41:14 AM Mahmood Naderan wrote:
> Hello,
> I have plotted a histogram chart which has positive and negative values. Problem is that the horizontal line on Y=0 (where the bars are built on that) is now moved to the bottom of the chart. This is ok however the bars look to be float in the space because the the horizontal line goes to bottom because of the xtics strings.
> 
> 
> Which option can draw a horizontal line at y=0 in addition to the bottom line?


set xzeroaxis

Re: [Gnuplot-info] drawing horizontal line

[Theo <th...@gm...>]

actually, if your x-axis is changing, the following would be better.

set arrow 1 from graph 0,first 0 to graph 1,first 0 nohead

It draws a horizontal line from the left to the right side of the graph 
at position y=0 of the first (x1) axis.

Re: [Gnuplot-info] drawing horizontal line

[Mahmood N. <nt_...@ya...>]

Yes thank you. The arrow with nohead will do that


 
Regards,
Mahmood



On Sunday, November 3, 2013 10:22 PM, Theo <th...@gm...> wrote:
 
assuming your x axis is ranging from 0 to 10
something like the following might help:

set arrow 1 from 0,0 to 10,0 nohead

for more details have a look at 'help arrow'



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Re: [Gnuplot-info] drawing horizontal line

[Theo <th...@gm...>]

assuming your x axis is ranging from 0 to 10
something like the following might help:

set arrow 1 from 0,0 to 10,0 nohead

for more details have a look at 'help arrow'

[Gnuplot-info] drawing horizontal line

[Mahmood N. <nt_...@ya...>]

Hello,
I have plotted a histogram chart which has positive and negative values. Problem is that the horizontal line on Y=0 (where the bars are built on that) is now moved to the bottom of the chart. This is ok however the bars look to be float in the space because the the horizontal line goes to bottom because of the xtics strings.


Which option can draw a horizontal line at y=0 in addition to the bottom line?



 
Regards,
Mahmood

Re: [Gnuplot-info] X-Y chart with series and labels

[Mahmood N. <nt_...@ya...>]

OK I found that it will be easier to create some data files, instead of integrating all data in one file and doing complex string formatting, and invoke them with plot command.

 
Regards,
Mahmood



On Sunday, November 3, 2013 11:50 AM, Mahmood Naderan <nt_...@ya...> wrote:
 
Hi,
I want to plot a scatter X-Y chart with the following specs

The chart contains some series (manufacturer name) and each series has some data points (a model at a given year). For example
"Year"   "AMD"        "IBM"
2000
2001              POWER4/32
2002
2003    K8/64
2004              POWER5/32
2005
2006
2007   K10/64
2008
2009

The data is interpreted in this way: AMD released K8 in 2003 and the value of K8 is 64. Or IBM released POWER5 in 2004 and the value of POWER5 is 32

So each point (the junction at year and value) has a label (K8, K10, ...). 

I looked in to the examples but all I saw were data points without labels and are easy ti understand.


 
Regards,
Mahmood
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[Gnuplot-info] X-Y chart with series and labels

[Mahmood N. <nt_...@ya...>]

Hi,
I want to plot a scatter X-Y chart with the following specs

The chart contains some series (manufacturer name) and each series has some data points (a model at a given year). For example
"Year"   "AMD"        "IBM"
2000
2001              POWER4/32
2002
2003    K8/64
2004              POWER5/32
2005
2006
2007   K10/64
2008
2009

The data is interpreted in this way: AMD released K8 in 2003 and the value of K8 is 64. Or IBM released POWER5 in 2004 and the value of POWER5 is 32

So each point (the junction at year and value) has a label (K8, K10, ...). 

I looked in to the examples but all I saw were data points without labels and are easy ti understand.


 
Regards,
Mahmood

[Gnuplot-info] pngcairo with 256 or 16 colors?

[Theo <th...@gm...>]

Hi there,
if I want to create compact PNG plots I have the choice between

term png
term pngcairo

where the pngcairo results usually look better.

png is saved either as 8 bit or 24 bit (truecolor) image
pngcairo seems to be always saved as 24 bit image independent whether 
it's mono or color.

If I take a pngcairo 24 bit color image and reduce the colors with an 
external image processing program to 8 bit or even 4 bit I save a quite 
some disc space (especially, if I have a lot of plots).
And mostly, 256 or even 16 colors are enough.

Is there a way to directly tell gnuplot to save 8 bit or 4 bit pngcairo 
images?

Thanks, Theo.