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How to output matrix grayscale?

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I am trying to output my matrix grayscale with imshow(), but its looks like gradient.
My code is:
s=4;
A=256;
N=200;
i=1:N;
r=0.1*(i-N/2);
f=exp(-r.^2/2/s^2);
M=A*(f'*f);
imshow(M,[]);
Please, help me to find a solution to this problem
  1 Comment
KALYAN ACHARJYA
KALYAN ACHARJYA on 4 Mar 2021
"matrix grayscale with imshow(), but its looks like gradient"
Can you re-read the statement again and explain more? graysclae is scale range (shaded variation), where as gradient is derivative?

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Accepted Answer

KALYAN ACHARJYA
KALYAN ACHARJYA on 4 Mar 2021
This one?
imagesc(M);
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More Answers (1)

Bjorn Gustavsson
Bjorn Gustavsson on 4 Mar 2021
You could use imagesc instead of imshow. Combined with colorbar you get a neat display of your matrix. Since you asked for gray-scale, you'll also have to set the colormap, so something like this:
imagesc(M)
colorbar
colormap(gray)
HTH

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