Plotting matrix in 2D

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

[Stephen23]

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.

Answer 1

[KSSV]

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.

[Roger Vota]

Thanks, it explained, but how to display matrix value as a square?

[KSSV]

I didn't get your question..

[Roger Vota]

how to plot matrix elements values as color coded squares without losing edges?

[KSSV]

doc surf