Cannot use 'interp' for 'FaceColor' in patch

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Nguyen Van Hieu
Nguyen Van Hieu 2021-3-20
评论： darova 2021-3-21
I want to have smoother colormap but the program said:
"Warning: Error creating or updating Patch
Error in value of property FaceVertexCData
Number of colors must equal number of vertices ".
The data are given in attached file. Please kindly help me!
s=patch(X,Y,E_t,'FaceColor','interp');
  1 个评论
darova
darova 2021-3-21
Can you exaplain what your data represents?
s = load('plate.mat');
x = s.X;
y = s.Y;
z = s.E_t;
patch(x,y,z,'facecolor','interp')
Each vertex should have it's own color

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DGM
DGM 2021-3-21
Your patch plot only has three colors, because your CData vector E_t only contains three unique values. Maybe that's the result of some prior nearest-neighbor interpolation process that could be made continuous? I don't know exactly what your CData values mean in-context, but are you sure you're not expecting to obtain something like this?
% try to return stepped CData to a smooth linear ramp
CD=interp1([1 13 25],unique(E_t)',1:36,'linear','extrap');
s=patch(X,Y,CD,'FaceColor','flat');
Why it's complaining about the 'interp' mode, I'm not sure. If you really need to use 'interp' mode, that question will need to be addressed.

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