gnuplot-py-users Mailing List for Gnuplot.py

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I get the same thing on fink's gnuplot 3.8i, but on a self compiled 
gnuplot (on x86 debian linux) it works as expected.  Granted, that 
isn't OS X, but I imagine the fink maintainer just didn't compile 
something or whatnot. I would try compiling your own gnuplot (make sure 
you set the configure options appropriately). Then put the full path to 
your new version in the gp_macosx.py file (set the variable 
gnuplot_command).

Cheers!
Andrew

Peter Stoltz wrote:
> Now my problem: I would like to make color contour plots
> (with pm3d for instance) to png, but I can't find palette
> settings that will allow this.  The code is shown below.
> When I run this code, I get:
>
> [localhost] pstoltz% python demo.py
> Error: terminal "png" does not support continous colors.
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Hi all,

I realize this question isn't specific to gnuplot-py, but
gnuplot-py users seem to be on the cutting edge of gnuplot
use, so I thought someone here might be able to help me.

First of all, I am running Mac OS 10.2.6, gnuplot 3.8i (from 
FINK), and the latest gnuplot-py (from CVS to get the
bug fix for temporary file deletion).

Now my problem: I would like to make color contour plots
(with pm3d for instance) to png, but I can't find palette
settings that will allow this.  The code is shown below.
When I run this code, I get:

[localhost] pstoltz% python demo.py
Error: terminal "png" does not support continous colors.

And the resulting png is drawn without pm3d.  I thought 
the 'set palette maxcolors' should fix the continuous color 
problem?  Is there some specific palette setting I *can* use to
write to png?

Any help appreciated.  And I'd like to second the motion
that a new release of gnuplot-py (with the temp file deletion 
fixed) happen as soon as time allows!

Thanks, 

Peter

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

import Gnuplot
from Numeric import arange, sin, NewAxis

g=Gnuplot.Gnuplot()
x = arange(35)/2.0
y = arange(30)/10.0 - 1.5
xm = x[:,NewAxis]
ym = y[NewAxis,:]
m = (sin(xm) + 0.1*xm) - ym**2
g('set data style lines')
g('set hidden')
g('set contour base')
g('set pm3d at sb')
g('set palette maxcolors 8')
g('set term png')
g('set output "out.png"')
g.title('An example of a surface plot')
g.xlabel('x')
g.ylabel('y')
g.splot(Gnuplot.GridData(m,x,y, binary=0))

David Porter wrote:

>Mike
>	I have a few Python/Gnuplot questions that I hope you may have an answer to.
>

I'm sending a copy of this response to the gnuplot-py-users mailing 
list.  Please consider subscribing and sending future questions to the list.

>1. How do you have a multi-line title? I have tried g.title("line1\nline2\nline3") and only line1 shows up on the plot. I have debug=1 and what I see is:
>gnuplot> set title "line1
>line2"
>what I think it should be is:
>gnuplot> set title "line1\nline2"
>

Then an immediate solution would be to type

 >>> g.title("line1\\nline2\\nline3")

or

 >>> g.title(r"line1\nline2\nline3")

Perhaps Gnuplot.py should quote newlines automatically?  If so, what 
other characters should it quote?

>2. Adding labels, I have been able to add  a label with the following:
>g('set label "Label text" at 0, floating point value') where floating point value is a real number on the y axis. What happens if "Label text is a string and floating point value is a variable:
>label_test = "Label Text"
>y1 = floating point value
>g('set label label_text, 0, y1')
>I guess the real question is how to tell gnuplot-py label_text is a string and y1 is a floating point value?
>  
>

You just need to use Python's "%" string operator:

 >>> g('set label "%s", 0, %g' % (label_test, y1,))

See the python tutorial or the python library reference (the section 
called "String Formatting Operations") at www.python.org for more 
information.

Michael

-- 
Michael Haggerty
mh...@al...