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Re: question about contourf command


From: Pantxo
Subject: Re: question about contourf command
Date: Mon, 17 Sep 2018 09:07:46 -0500 (CDT)

Tso-Min Chou 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
> [image: image.png]
> 
> This one is from Matlab
> [image: image.png]
> 
> And here is my script file run in both Octave and Matlab.
> data = importdata('error_demo_2.txt') ;  % 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
> 
> 
> 
> 
> image.png (41K)
> <http://octave.1599824.n4.nabble.com/attachment/4689419/0/image.png>
> image.png (25K)
> <http://octave.1599824.n4.nabble.com/attachment/4689419/1/image.png>

Hi,

You did not attache the input file so that it is impossible for us to
reproduce and eventually diagnose this origin of the issue.
Could attach 'error_demo_2.txt'?

Pantxo



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