Find min in matrix given specific rows and columns?
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I have a matrix, A, and I want to find the minimum value given specified row and column vectors, r and c. I also want to return the col and row of that minimum value in A. Any idea how to find the min? Given A, r, and c, the answer for this scenario should be a min value of 1 because it is in row 1, col 1, which is a part of the r and c vectors.
A = [1 12 23 19 1 13;
2 3 13 34 5 75;
5 22 45 5 1 94;
4 5 68 2 5 17;
2 4 34 11 13 92];
r = [1 3 4];
c = [1 2 3];
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Star Strider
2017-8-1
One approach:
idx = sub2ind(size(A), r', c'); % Define ‘Eligible’ Elements As Linear Index Vector
[minval,minidx] = min(A(:)); % Minimum & Location (Linear Index)
[rmin,cmin] = ind2sub(size(A),intersect(minidx,idx)); % Recover Row, Column Indices Of ‘Eligible’ Minimum
fprintf('\nMinimum of A = %d, at [%2d,%2d]\n', minval, rmin, cmin)
Minimum of A = 1, at [ 1, 1]
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