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## Re: question about contourf command

 From: Doug Stewart Subject: Re: question about contourf command Date: Mon, 17 Sep 2018 14:55:17 -0400

On Mon, Sep 17, 2018, 1:27 PM Tso-Min Chou, <address@hidden> wrote:
Doug,

It's V4.4.0 for windows. Just standard no extra packages.

Tso-Min

Keep the list informed

On Mon, Sep 17, 2018 at 9:51 AM Doug Stewart <address@hidden> wrote:

On Mon, Sep 17, 2018 at 9:24 AM Tso-Min Chou <address@hidden> wrote:
Hi,
I did the 2D filled contour plot with both Octave and Matlab with same script file; but the filled contour plots are very different. I also checked the data file and they are the same.

The following plot is from Octave

This one is from Matlab

And here is my script file run in both Octave and Matlab.
data = "" ;  % read file
x = data(:,1);
y = data(:,2);
z = data(:,3);
% Grid
%x0 = min(x) ; x1 = max(x) ;
%y0 = min(y) ; y1 = max(y) ;
%N = 10 ;
%x2 = linspace(x0,x1,N) ;
%y2 = linspace(y0,y1,N) ;
%[X,Y] = meshgrid(x2,y2) ;
[X,Y] = meshgrid(sort(x),sort(y));
Z = griddata(x,y,z,X,Y,'linear');
figure (1)
contourf(X,Y,Z);
colormap ('jet')
colorbar
figure (2)
meshc(X,Y,Z)
colormap ('jet')
colorbar
figure (3)
contour(X,Y,Z);
%meshc(X,Y,Z)
colormap ('jet')
colorbar
xlabel ('Vds')
ylabel ('Ids(mA/mm)')
title ('S11 VAEerr')

Anyone can tell me what is the reason for the difference and how to solve it?

Thanks,

TM

What version of Octave are you using?
What OS?
Any packages installed?

--
DAS