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I need a disc inside a matrix. for example:
thanks for your help:)

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Roger Stafford
Roger Stafford 2014-2-2

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It would be better to use the term 'disk' or 'disc' for this. The term 'circle' generally refers to the one-dimensional curve surrounding a two-dimensional disk.
Let ic and jc be the desired indices for the disk's center and r be its radius, and let m and n be the numbers of rows and columns, respectively, in the array.
[I,J] = ndgrid(1:m,1:n);
M = double((I-ic).^2+(J-jc).^2<=r^2); % <-- M should be your desired array

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