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how change elements around the special element in matrix

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fatema saba
fatema saba 2015-11-11
评论： fatema saba 2015-11-11
Hello please guide me.
A is
A=zeros(100,100)
i a j is selected randomly for example i=9 and j=8. I want to change element of matrix A to 1 on the basis of i and j. In fact elements that are around the element(i=9,j=8) should be changed to 1. my picture shows that. yellow cell is (i=9,j=8) and orange cells should be changed. each time i and j may be changed and this will change everything. Thank you

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Image Analyst
Image Analyst 2015-11-11
Try this:
A(i-3:i+3, j-3:j+3) = 1; % Or whatever value you want.
If you want to change just the surrounding values and not the i,j value, then save it and restore it:
savedValue = A(i,j);
A(i-3:i+3, j-3:j+3) = 1; % Or whatever value you want.
A(i,j) = savedValue;

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