Plotting matrix in 2D

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Roger Vota
Roger Vota 2017-4-3
评论： KSSV 2017-4-4
Hello, I am expecting to see 8X8 plot of a matrix, but instead of it plots 7X7. Edge data are not plotted, why?
m = [nan, nan, nan, nan, -.053, nan, nan, nan, nan, nan, nan, nan, nan, nan, nan, -0.0167, nan, nan, nan, nan, -0.0218, nan, nan, nan, nan, nan, nan, -0.02688, nan, -0.0248, -0.0224, -0.0314, -0.0211, nan, -0.0234, -0.0437, -0.00788, -0.0235, -0.02188, -0.0219, -0.02357, -0.0233, -0.0231, nan, -0.0382, nan, -0.0215, -0.0239, nan, -0.0355, nan, nan, nan, nan, 0.0622, -0.0245, -0.0228, nan, nan, nan, nan, nan, nan, nan];
M = reshape(m, 8, 8);
for k=1:64
k = find(isnan(M))';
M(k) = 0;
end
figure (2)
surface(M) % 2D view
  1 个评论
Stephen23
Stephen23 2017-4-3
编辑：Stephen23 2017-4-3
If you plot four points at the corners of a square, then you will get one square. You should count the nodes, not the squares.

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KSSV
KSSV 2017-4-3
The plot is correct...in the below count the number of points:
figure (2)
surface(M) % 2D view
hold on
[X,Y] = meshgrid(1:8,1:8) ;
plot3(X,Y,M,'*r')
There are 64 points. What you are counting is number of squares.
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Roger Vota
Roger Vota 2017-4-4
how to plot matrix elements values as color coded squares without losing edges?

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