gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Some links to update on gnuplot.info

[<br...@ph...>]

First of all, thanks for the information.

ros...@et... wrote:
> On the "Gnuplot pages in French" section of page:
> http://www.gnuplot.info/help.html

Please note that the above is a secondary copy.  The master copy (the 
one immediately editable) is http://gnuplot.sourceforge.net/help.html. 
So if you want to check back immediately, the sourceforge page is the 
one to look at.

As to the proposed changes: I've edited them in.

I'm not sure what's up with the links to freeduc and usherb.ca.  At the 
time I'm typing this, freeduc replies with a HTTP 500, usherb.ca times out.

Re: [Gnuplot-info] Exact splot size for animation

[<br...@ph...>]

Stefan Urbanek wrote:
> Cit=E1t Gavin Buxton <gav...@ya...>:

>> I don't think you want to use set size square. If I've
>> understood you correctly all you need to do is to make
>> sure that your plot ranges are all the same.=20

That's one possible approach, but not the only one.  See my earlier=
=20
reply about 'set lmargin'.

> 1. export data from DB (something like: plot, x, y, value)
> 2. split data into files according to "plot" and make "isolines" (f=
ile format:
> x, y, value)
> 3. create plot files from a template:
>=20
> set palette
> set pm3d map
> set terminal png
> splot "@@FILENAME@@"
>=20
> 4. execute gnuplot for each plot file and generate png images

You don't really have to create files.  gnuplot can be remote-control=
led=20
by feeding it commands and (inlined) data from another application=
=20
through its stdin channel.

Re: [Gnuplot-info] Call wgnuplot from C#

[<br...@ph...>]

Koto Norose wrote:
> Process.Start("wgnuplot.exe", "load 'command.gp'");
> 
> But it doesn't show me anything.

Of course it doesn't.  I'm somewhat at a loss how you arrived at the 
idea it should, given that you already found out that

>>From DOS window, if I type:
> 
> wgnuplot.exe, load 'command.gp'
> 
> but this also doesn't work.  

Failure to RTFM.  "help introduction" would have explained that.

Re: [Gnuplot-info] (no subject)

[<br...@ph...>]

Ron Watkins wrote:
> Im having 2 problems. First, when gnuplot starts (Windows), it comes up in
> Terminal font, and I have to change the font to Courier New so that I can
> read the screen. 

Changing the font is almost certainly not necessary.  Changing its size, is.

 > Is there some way to save this setting as the default?

Yes.  "Update [...]wgnuplot.ini" in the same menu you found "Choose 
font...".

> Second, im having trouble in the plot command with trying to figure out
> where the file is expected to be. I have tried my documents, the directory
> where the bin file is located, C:, others with no luck. Is there a way to
> determine where it expects to see the data files, 

Yes.  gnuplot has a current working directory, and all relative 
pathnames are relative to that.  You can change it using 'cd', and check 
it using 'pwd'.  If you load a script via the 'File' menu, gnuplot will 
'cd' to its directory automatically.

> or is there a way to provide a full pathname to the data file?

Yes, and yes.  I'm wondering how the latter can fail to be obvious: of 
course you can pass the full pathname as an argument.  The only tricky 
business is that paths had better be typed using forward slashes:

	plot 'c:/foo/whatever/my.dat'

because you have to use single quotes, or double up all backslashes:

	plot 'c:\foo\whatever\my.dat'
	plot "c:\\foo\\whatever\\my.dat"

[Gnuplot-info] Call wgnuplot from C#

[Koto N. <kot...@gm...>]

Hi,

I'd like to call wgnuplot from C#.  First I made a file by using
"save" command.  That file has some commands for wgnuplot.

Next I wrote the C# code as:

Process.Start("wgnuplot.exe", "load 'command.gp'");

But it doesn't show me anything.
Does anyone has idea?

As a reference, I could call wgnuplot by the code:

Process.Start("wgnuplot.exe");

I would like to let wgnuplot do the sequence of the command.


I asked this question to the gnuplot people, not .NET people (yet)
because I think the command of DOS window will work for
Process.Start() function of C#.

>From DOS window, if I type:

wgnuplot.exe, load 'command.gp'

but this also doesn't work.  So I guess if I could know how to type in
DOS window to make wgnuplot do some commands, I also could call the
above C# command.  If anyone has an advice, please let me know.

Thank you very much,

Koto

[Gnuplot-info] (no subject)

[Ron W. <rwa...@ds...>]

Im having 2 problems. First, when gnuplot starts (Windows), it comes up in
Terminal font, and I have to change the font to Courier New so that I can
read the screen. Is there some way to save this setting as the default?
Second, im having trouble in the plot command with trying to figure out
where the file is expected to be. I have tried my documents, the directory
where the bin file is located, C:, others with no luck. Is there a way to
determine where it expects to see the data files, or is there a way to
provide a full pathname to the data file?
Thanks,
Ron

Re: [Gnuplot-info] Exact splot size for animation

[Stefan U. <st...@ag...>]

Citát Gavin Buxton <gav...@ya...>:

> Hi,
> 
> I don't think you want to use set size square. If I've
> understood you correctly all you need to do is to make
> sure that your plot ranges are all the same. Go
> through your data and find the largest ranges in x, y
> and z and set these values for all plots using set
> xrange. 
> 
> Hope this helped,

Thanks, that helped. However ... problem is, that i use it inside of an
automated process:

1. export data from DB (something like: plot, x, y, value)
2. split data into files according to "plot" and make "isolines" (file format:
x, y, value)
3. create plot files from a template:

set palette
set pm3d map
set terminal png
splot "@@FILENAME@@"

4. execute gnuplot for each plot file and generate png images

If I understand it correctly, then my plot file template should look like this:

set palette
set pm3d map
set terminal png
set xrange [@@XMIN@@:@@XMAX@@]
set yrange [@@YMIN@@:@@YMAX@@]
splot "@@FILENAME@@"

And I should replace the @@XMIN@@ ... @@YMAX@@ values according to the input
data. That would mean, that export of data from DB is not sufficient and I
would have to export also following table: (plot, xmin, xmax, ymin, ymax) and
use that values in the template.

Will this give me the result I want?

Now I have to figure out, how to generate gnuplot files using the min-max table
stored in a file. Replacing single filename was not a problem...

Stefan


> 
> Gavin.
> 
> 
> > Hi,
> > 
> > I am drawing several plots like this:
> > 
> > set palette
> > set pm3d map
> > set size square
> > set terminal png
> > splot "plotXX.data"
> > 
> > Where XX is sequence number. Output are png files.
> > 
> > I would like to have the images of same size and to
> > have the plots (map area)
> > same size as well, with exact position inside the
> > image? In other words, I
> > would like to put the images into a sequence and
> > create kind of animation. For
> > that I need the map to of the same size and on the
> > same position in each
> > "animation frame".
> > 
> > Thanks for any hints,
> > 
> > Stefan Urbanek
> > 
> 
> __________________________________________________
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> 
> 


Stefan Urbanek
--
http://stefan.agentfarms.net

First they ignore you, then they laugh at you, then they fight you, then
you win.
- Mahatma Gandhi

Re: [Gnuplot-info] Exact splot size for animation

[Gavin B. <gav...@ya...>]

Hi,

I don't think you want to use set size square. If I've
understood you correctly all you need to do is to make
sure that your plot ranges are all the same. Go
through your data and find the largest ranges in x, y
and z and set these values for all plots using set
xrange. 

Hope this helped,

Gavin.


> Hi,
> 
> I am drawing several plots like this:
> 
> set palette
> set pm3d map
> set size square
> set terminal png
> splot "plotXX.data"
> 
> Where XX is sequence number. Output are png files.
> 
> I would like to have the images of same size and to
> have the plots (map area)
> same size as well, with exact position inside the
> image? In other words, I
> would like to put the images into a sequence and
> create kind of animation. For
> that I need the map to of the same size and on the
> same position in each
> "animation frame".
> 
> Thanks for any hints,
> 
> Stefan Urbanek
> 

__________________________________________________
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[Gnuplot-info] Some links to update on gnuplot.info

[<ros...@et...>]

Hi,

Thanks for your work with this very nice tool.
Here I have checked some links, can you update your site or

On the "Gnuplot pages in French" section of page:
http://www.gnuplot.info/help.html

the link to: Gnuplot, traceur et grapheur: tutorial et traduction de  
la documentation de gnuplot 3.7.1;
http://logiciels-libres-cndp.ac-versailles.fr/gnuplot/
sould be
http://logiciels-libres-cndp.ac-versailles.fr/article.php3?id_article=70
Moreover there is no documentation translation, so the link should be called:
Gnuplot, traceur et grapheur: tutorial de gnuplot 3.7.1;

the link to: Gnuplot, LYX et LATEX: une bonne introduction
http://lea-linux.org/cached/index/Software-gnuplot3.html
should be
http://lea-linux.org/cached/index/Software-soft_texte-gnuplot3.html

the link to: Du bon usage de gnuplot: une large introduction
should be specified to: Du bon usage de gnuplot: une large  
introduction (gnuplot 3.6)

the link to: Traceur des fonctions en C++ avec gnuplot: Premiers pas  
avec gnuplot et plus
http://www.univ-pau.fr/Artouste/fr/composants/gnuplot/ManuelutilisateurGnuplot.htm
is dead. I did not find where this page went. I guess it is to be removed.


regards
Frederic

Re: [Gnuplot-info] Exact splot size for animation

[<br...@ph...>]

Stefan Urbanek wrote:
> 
> set palette
> set pm3d map
> set size square
> set terminal png
> splot "plotXX.data"
> 
> Where XX is sequence number. Output are png files.
> 
> I would like to have the images of same size and to have the plots (map area)
> same size as well, with exact position inside the image? 

Then you shouldn't have used 'set size square'.  That makes the shape of 
the graph area dependent on the ratio of axis ranges.

You may want to use 'set lmargin' & friends instead, which fix the 
relation between the "paper" size and that of the graph.

[Gnuplot-info] Exact splot size for animation

[Stefan U. <st...@ag...>]

Hi,

I am drawing several plots like this:

set palette
set pm3d map
set size square
set terminal png
splot "plotXX.data"

Where XX is sequence number. Output are png files.

I would like to have the images of same size and to have the plots (map area)
same size as well, with exact position inside the image? In other words, I
would like to put the images into a sequence and create kind of animation. For
that I need the map to of the same size and on the same position in each
"animation frame".

Thanks for any hints,

Stefan Urbanek
--
http://stefan.agentfarms.net

First they ignore you, then they laugh at you, then they fight you, then
you win.
- Mahatma Gandhi

Re: [Gnuplot-info] How can I normalize my plots /read the value of the first data point

[<br...@ph...>]

sternenstaunerlaus wrote:

> One simple solution would be to type "using $1:($2/DP1)" where DP1 is a
> variable formely defined as value of the first data point.
> Unfortunately this doesn't help me, since I have more than 300 files to plot
> and it has to be done in an automatic way.
> 
> Is there a way to read a certain value out of a set of Data (e.g. column 1,
> row 1)?

Not inside gnuplot.  But external tools can help, if you're doing this 
on a sane platform.  You'll have to write a little script (in awk, Perl 
sh or something like those, depending on your personal preferences) that 
does the extraction job, and prints the number to stdout:

	DP1=`your_tool your_file.dat`

[Gnuplot-info] How can I normalize my plots /read the value of the first data point

[sternenstaunerlaus <ste...@gm...>]

Hello,
 I am working on a scientific paper and I have started plotting my data
using gnuplot.

I have come to a point where I don't know how go on. Neither in your nor in
other FAQs I found a clue to my problem:

I want to plot different exponential decay-curves (from
1H-NMR-Measurements). The data curves start from different data points and
decay nearly exponentially to zero. 
It is useful and common in this problem to normalize the curves to the first
data point, i.e. to divide every y-value by the first y-value. By doing
this, one gets exponential curves which start at y==1 and decay to y==0.
This is helpful because only the shape of the decay-curve is interesting,
not the absolute value.

One simple solution would be to type "using $1:($2/DP1)" where DP1 is a
variable formely defined as value of the first data point.
Unfortunately this doesn't help me, since I have more than 300 files to plot
and it has to be done in an automatic way.

Is there a way to read a certain value out of a set of Data (e.g. column 1,
row 1)?
Is there a different way to normalize the curves to the first data point?

Thank you in advance for your help. 

Stephan (sternenstaunerlaus)
--
View this message in context: http://www.nabble.com/How-can-I-normalize-my-plots--read-the-value-of-the-first-data-point-t1843451.html#a5032074
Sent from the Gnuplot - User forum at Nabble.com.

Re: [Gnuplot-info] splot 3D vectors given in component form

[<br...@ph...>]

Michael wrote:
> Also, the axes are shown at the sides of the graph instead of at the 
> origin. 

That's on purpose.  Axes in the middle of the drawable region are 
generally a bad idea if a automaton is to draw in that region.  It takes 
a human to tick and label an axis in the middle of the graph, and avoid 
getting either unreadable payload data or unreadable ticks.

> My questions:
> 
> 1) How can I show my vector(s) alone?

By plotting an entirely out-of-range function:

	set zrange [-1:1]
	splot 2.0

Or, if you updated beyond version 4.0, by doing a 3D 'with vectors' plot.

Re: [Gnuplot-info] Help for viewing

[<br...@ph...>]

Didier Eggerickx wrote:
> 
> Hello,
>  
> I run with Windows XP SP2, I've installed the windows version og 
> Gnuplot, but the text in the windows commands line is unreadable : bad 
> policy, bad size; how can I modify that? 

Via the context menu: right-click on the text window, choose a readable 
font.

 > I was looking for a
> WGNUPLOT.INI file, but no one to find!

It's only written on request, from that same context menu.  Until then, 
gnuplot operates on compile-time defaults.

Re: [Gnuplot-info] How to stop gnuplot using Helvetica in eps files?

[<br...@ph...>]

Chris Thornton wrote:
> Is there any way to stop using gnuplot from using Helvetica font for line
> labels when generating eps (apart from editing the output!) 

By specifying a different font on the 'set term postscript' line.

 > This causes a
> freeze-up when you try to place a gnuplot eps file in Illustrator. 

That strikes me as spectacularly silly on Illustrator's side.  Helvetica 
is _the_ default fall-back font of the entire PostScript and Laser 
printing world, and Illustrator crashes on files just because the have 
the nerve to explicitly request it?  Someone's gotta be kiddin' here.

Re: [Gnuplot-info] How to plot each group of data points in a data file with different point style?

[<br...@ph...>]

Jun Yang wrote:

> I want to plot each group of data points in a data file with different
> point style, but I don't know how to.

gnuplot doesn't know either.

> I've seperated each group of data points with double blank lines
> according to the manual, but it seems doesn't work.

It works just fine --- it just doesn't do what you thought it would, 
because the documentation is somewhat unclear on this.  Where it says:

--- quote 'help datafile' ---
Data separated by double blank records are treated as if they were in 
separate data files.
--- end quote ---

that "treated as if" doesn't extend to giving each sub-dataset its own 
automatic linetype increment, as actual separate files get it.  You'll 
have to address files individually or use the 'palette' feature (version 
4.0 and up) for that.

Re: [Gnuplot-info] help here?

[<br...@ph...>]

Valentina Beato wrote:
> I downloaded gnuplot 4.1 from the repository, but as soon as I run
> ./prepare I get
> 
> mv Makefile.amt Makefile.am
> automake: configure.in: required file `../config.guess' not found
> automake: configure.in: required file `../config.sub' not found

This is a telltale symptom of having too old autoconf/automake.  You'll 
want to have the latest you can get: automake 1.9.6 and autoconf 2.59, 
or higher.

Re: [Gnuplot-info] help here?

[Dieter J. <die...@t-...>]

Dear Valentina,
please try:
cd gnuplot-4.1.0 /* or whatever is it's name! */
touch  configure.in
rm -f config.status config.log config.cache aclocal.m4
=2E/prepare
aclocal -I m4
autoconf
=2E/configure <your options>

If you're running SuSE and want a src.rpm for your convenience, just let me=
=20
know, I could send you via email (~2 MByte)

Take care


Dieter Jurzitza


Am Dienstag, 20. Juni 2006 18:29 schrieb Valentina Beato:
> I downloaded gnuplot 4.1 from the repository, but as soon as I run
> ./prepare I get
>
> mv Makefile.amt Makefile.am
****
=2D-=20
=2D----------------------------------------------------------

                               |
                                \
                 /\_/\           |
                | ~x~ |/-----\   /
                 \   /-       \_/
  ^^__   _        /  _  ____   /
 <=B0=B0__ \- \_/     |  |/    |  |
  ||  ||         _| _|    _| _|

if you really want to see the pictures above - use some font
with constant spacing like courier! :-)
=2D----------------------------------------------------------

[Gnuplot-info] help here?

[Valentina B. <Val...@ro...>]

I downloaded gnuplot 4.1 from the repository, but as soon as I run
./prepare I get

mv Makefile.amt Makefile.am
automake: configure.in: required file `../config.guess' not found
automake: configure.in: required file `../config.sub' not found

Some part of the preparation process failed.

Is that a problem of my machine or a bug?

Thanks
Valentina

Re: [Gnuplot-info] splot 3D vectors given in component form

[Gavin B. <gav...@ya...>]

The answer to your first question is to plot an
arbitrary function outside of the range of the plot;
i.e., splot -10 and then set zrange between 0 and 1 or
whatever.

The second question I'm not too sure about. In 2D
plots you can do the following:
set xzeroaxis lt -1
set yzeroaxis lt -1
unset border
set xtics axis
set ytics axis

This gives you what I think you want, but it only
works in 2D (I think) I don't know about 3D. 


> I want to create graphs for my homework assignment. 
> I have vectors in 
> component form (ex. <0,1,0>).  I want to show 3D
> vectors by themselves, 
> but I can't figure out how to do that.  I tried
> looking at 
> arrowstyle.dem, but I don't understand how it works.
> 
> This is what I can do:
> 
> gnuplot> set arrow from 0,0,0 to 1,0,0
> gnuplot> splot x
> 
> Now I can see the vector that I want, but the only
> way I can show it is 
> by graphing an arbitrary function, which is not what
> I want. 
> 
> Also, the axes are shown at the sides of the graph
> instead of at the 
> origin. 
> 
> My questions:
> 
> 1) How can I show my vector(s) alone?
> 
> 
> 
> 2) How do I make the axes show as the X-,Y-, and
> Z-axes (instead of 
> showing at the edges of the graph)?
> 
> 

__________________________________________________
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[Gnuplot-info] 3D gnuplot

[Astan C. <st...@al...>]

Hi,
I was looking at http://dynamicnetservices.com/~will/gnuplot/ 
<http://dynamicnetservices.com/%7Ewill/gnuplot/> which attempted to plot 
3D images using gnuplot. Im trying to plot 3D images too but they're 
more of objects rather than shapes. I was wondering how do you plot 
hemispheres or half hemispheres. What Im really attempting to plot is an 
image which looks something like 
http://www.resa.net/nasa/images/io/io%20core.JPG 
<http://www.resa.net/nasa/images/io/io%20core.JPG> using gnuplot.
Any ideas?
Thanks for your help.
Cheers
Astan

[Gnuplot-info] splot 3D vectors given in component form

[Michael <mfm...@pr...>]

Hi,

I want to create graphs for my homework assignment.  I have vectors in 
component form (ex. <0,1,0>).  I want to show 3D vectors by themselves, 
but I can't figure out how to do that.  I tried looking at 
arrowstyle.dem, but I don't understand how it works.

This is what I can do:

gnuplot> set arrow from 0,0,0 to 1,0,0
gnuplot> splot x

Now I can see the vector that I want, but the only way I can show it is 
by graphing an arbitrary function, which is not what I want. 

Also, the axes are shown at the sides of the graph instead of at the 
origin. 

My questions:

1) How can I show my vector(s) alone?



2) How do I make the axes show as the X-,Y-, and Z-axes (instead of 
showing at the edges of the graph)?



Thanks,
Michael

[Gnuplot-info] Help for viewing

[Didier E. <did...@sk...>]

Hello,

I run with Windows XP SP2, I've installed the windows version og =
Gnuplot, but the text in the windows commands line is unreadable : bad =
policy, bad size; how can I modify that? I was looking for a =
WGNUPLOT.INI file, but no one to find!
Thanks for your help,

Didier Eggerickx


E-mail : did...@sk...

Re: [Gnuplot-info] How to plot each group of data points in a data file with different point style?

[Jun Y. <Jun...@ni...>]

Thank you for your reply.

Can it be automatically done? Actually I generated the data file by
running some  clustering program on the raw data, so I don't know how
many clusters there are in the data file if I don't open and inspect it.
In the manual it says "Data separated by double blank records are
treated as if they were in separate data files" , so I think it should
be handled correctly. =20
Have anyone done this before?



Best Regards,

Jun Yang
=20
-----Original Message-----
From: Marek W. Gutowski [mailto:gu...@if...]=20
Sent: Friday, June 16, 2006 7:54 PM
To: Jun Yang
Subject: Re: [Gnuplot-info] How to plot each group of data points in a
data file with different point style?

Hi,
Try:

plot 'your_data_file' index 0 u 1:3 with points 1, '' index 1 u 1:3 w
points 2

and read more by typing 'help index' at gnuplot's prompt.

Good luck!
Marek Gutowski


Jun Yang wrote:
> Hi,
>=20
> I am using Gnu Plot 4.0 under WindowsXP.
> I want to plot each group of data points in a data file with different

> point style, but I don't know how to.
> I've seperated each group of data points with double blank lines=20
> according to the manual, but it seems doesn't work.
> Please somebody help!
>=20
>=20
> Best Regards,
>=20
> Jun Yang
>=20
>=20
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--
Marek W. Gutowski
Institute of Physics, ON-3.2, Al. Lotnikow 32/46
02-668 Warszawa, POLAND, tel. +48-22-0228436601 ext. 3122  >> To talk or
not to talk?  Yes, talk, plain ASCII please <<
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~