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Finding corners of a matrix inside a matrix.

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Swapnil Rane
Swapnil Rane 2018-2-26
评论： Swapnil Rane 2018-2-26
I have a matrix of size 50*80 which contains non-zero values in the center of matrix. for example-- I would like to extract the position of the corner elements in that matrix i.e position of (0,0,5,7) elements. Can anyone help me with the code?
A=[0 0 0 0 0 0 0 0 ;
0 0 0 2 4 5 0 0;
0 0 4 0 5 2 1 0;
0 0 5 8 7 6 7 0;
0 0 0 0 0 0 0 0;
end

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Birdman
Birdman 2018-2-26
[r,c]=find(A~=0);
upperLeft=A(min(r),min(c))
lowerLeft=A(max(r),min(c))
upperRight=A(min(r),max(c))
lowerRight=A(max(r),max(c))
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Swapnil Rane
Swapnil Rane 2018-2-26
@KL and @Stephen Cobeldick, both of the code works for me.
Thank you, I really appreciate it.

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