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Re: pcolor and patch
From: |
Henry F. Mollet |
Subject: |
Re: pcolor and patch |
Date: |
Thu, 25 Feb 2010 18:49:53 -0800 |
User-agent: |
Microsoft-Entourage/11.1.0.040913 |
on 2/24/10 9:05 PM, John W. Eaton at address@hidden wrote:
> On 24-Feb-2010, RENOO wrote:
>
> | This is my first post here as I am starting using Octave and I must confess
> | that I am very happy of the quality of this software so far:clap:
> |
> |
> | However, there is one feature I can not make.
> |
> | I would like to plot my data using a pcolor and then add a patch to hide a
> | part of those data.
> | I assumed that using the contourf command is equivalent at finding the
> | cordinates of the isoline with the contourc command and then applying the
> | patch command.
> |
> | So here is a simple example of my script :
> |
> | [X,Y,Z] = peaks(50);
> | pcolor(X,Y,Z); shading flat
> | hold on
> | contourf(X,Y,Z,[1 1],'k')
> |
> | error: patch: property value is missing
> | error: evaluating if command near line 205, column 3
> | error: called from `contourf:parse_args' in file
> | `/usr/share/octave/3.0.5/m/plot/contourf.m'
> | error: called from `contourf' in file
> | `/usr/share/octave/3.0.5/m/plot/contourf.m'
> |
> | So I tried without any properties :
> | octave:14> contourf(X,Y,Z,[1 1])
> | error: gnuplot (as of v4.2) only supports 2D filled patches
> | error: evaluating if command near line 537, column 9
> | ....
> |
> | google ( and the message error ) told me it comes from gnuplot backend.
> |
> | So I tried from this http://old.nabble.com/FLTK-howto--td27703703.html post
> |
> | backend("fltk")
> |
> | and this leads me to the following error message :
> |
> |
> | octave3.2:3> [X,Y,Z] = peaks(50);
> | octave3.2:4> pcolor(X,Y,Z); shading flat
> | octave3.2:5> hold on
> | octave3.2:6> contourf(X,Y,Z,[1 1],'k')
> | error: mx_el_lt: nonconformant arguments (op1 is 1x2, op2 is 0x0)
> | error: evaluating argument list element number 1
> | error: evaluating argument list element number 1
> | error: called from:
> | error: /usr/share/octave/3.2.2/m/plot/__contour__.m at line 238, column 15
> | error: /usr/share/octave/3.2.2/m/plot/__contour__.m at line 188, column 3
> | error: /usr/share/octave/3.2.2/m/plot/contourf.m at line 73, column 5
> |
> | I am running octave
> | octave3.2:6> version
> | ans = 3.2.2
> |
> | and I also tried with QtOctave version 0.8.1 which runs octave
> | octave:13> version
> | ans = 3.0.5
> |
> | but in vain.
> |
> | Any help ?
>
> You can avoid the nonconformant argument error by setting the level
> argument to contourf to be something like [1, 1+eps] instead of [1, 1].
> That's a bug, and I've checked in the following change:
>
> http://hg.savannah.gnu.org/hgweb/octave/rev/f074aa6b2c80
>
> But I don't think gnuplot 4.2 will work for this plot even with this patch:
>
> error: gnuplot (as of v4.2) only supports 3D filled triangular patches
> error: called from:
> error: /home/jwe/src/octave/scripts/plot/__go_draw_axes__.m at line 592,
> column 6
> error: /home/jwe/src/octave/scripts/plot/__go_draw_figure__.m at line 102,
> column 1
> error: /home/jwe/src/octave/scripts/plot/gnuplot_drawnow.m at line 99,
> column 5
>
> I don't know whether later versions avoid this problem.
>
> Using the fltk backend with the current sources, I get the first plot
> attached below. I suspect that is not what you are looking for.
> Using contour instead of contourf, I get the second attached plot. It
> looks more reasonable, but I'm not sure whether that is the image you
> want.
>
> BTW, it is best to report bugs to the address@hidden mailing list.
>
> jwe
>
With G N U P L O T Version 4.2 patchlevel 5
Contourf does not work but contour does and produces attached. Almost
identical results when I use backend ("fltk"). That is contourf does not
work but contour does. Difference compared to attached AquaTerm plot saved
as pdf is that I don't have x and y scale and saving it as a pdf would
require a bit more work.
Henry
GNU Octave, version 3.2.2
Copyright (C) 2009 John W. Eaton and others.
octave-3.2.2:1> [X,Y,Z] = peaks(50);
octave-3.2.2:2> pcolor(X,Y,Z); shading flat
octave-3.2.2:3> hold on
octave-3.2.2:4> contourf(X,Y,Z,[1 1],'k')
error: mx_el_lt: nonconformant arguments (op1 is 1x2, op2 is 0x0)
error: evaluating argument list element number 1
error: evaluating argument list element number 1
error: called from:
error:
/Applications/Octave.app/Contents/Resources/share/octave/3.2.2/m/plot/__cont
our__.m at line 238, column 15
error:
/Applications/Octave.app/Contents/Resources/share/octave/3.2.2/m/plot/__cont
our__.m at line 188, column 3
error:
/Applications/Octave.app/Contents/Resources/share/octave/3.2.2/m/plot/contou
rf.m at line 73, column 5
octave-3.2.2:4> contour(X,Y,Z,[1 1],'k')
octave-3.2.2:5>
octave-3.2.2:1> backend ("fltk")
octave-3.2.2:2> [X,Y,Z] = peaks(50);
octave-3.2.2:3> pcolor(X,Y,Z); shading flat
octave-3.2.2:4> hold on
octave-3.2.2:5> contourf(X,Y,Z,[1 1],'k')
error: mx_el_lt: nonconformant arguments (op1 is 1x2, op2 is 0x0)
error: evaluating argument list element number 1
error: evaluating argument list element number 1
error: called from:
error:
/Applications/Octave.app/Contents/Resources/share/octave/3.2.2/m/plot/__cont
our__.m at line 238, column 15
error:
/Applications/Octave.app/Contents/Resources/share/octave/3.2.2/m/plot/__cont
our__.m at line 188, column 3
error:
/Applications/Octave.app/Contents/Resources/share/octave/3.2.2/m/plot/contou
rf.m at line 73, column 5
octave-3.2.2:5> contour(X,Y,Z,[1 1],'k')
octave-3.2.2:6>
Figure 1.pdf
Description: Binary data