MATLAB: Odd output from ind2sub

findind2sub

I'm trying to spit out indices for max values in a large matrix at a specific point in time (in this case obs 1560, t(:, :, 1560))

>> [I J]=ind2sub(size(t), (max(max(t(:, :, 1560)))))

But my I is equal to the actual value in the cell, not the row

I =
     28.5048

And J makes no sense:

J =
       1

Is the error in my code obvious to anyone? Thanks,

Best Answer

s = size(t);
[val,ij] = max(reshape(t(:, :, 1560),[],1);
[ii,jj] = ind2sub(s(1:2),ij);
idxs = [ii,jj,1560];

ind = prod(s(1:2))*1559 + ij;

Related Solutions

MATLAB: How to use ind2sub in this problem

you dont need to use ind2sub if you use max...

copied from doc max

[M,I] = max(...) finds the indices of the maximum values of A and returns them in output vector I, using any of the input arguments in the previous syntaxes. If the maximum value occurs more than once, then max returns the index corresponding to the first occurrence.

A=1000*sin(reshape(10:999, 30, 33));
[maxA,indexA]=max(A(:));
j=ceil(indexA/size(A,1));
i=mod(indexA,size(A,1));
if i==0
    i=size(A,1);
end
A(indexA)
A(i,j)

should be your desired maximum

or the boring solution:

[i,j] = ind2sub(size(A),indexA);

ind2sub uses modulo as well

MATLAB: Obtain row and column indices of non-zero matrix elements

Of course, there is, use the two output version of find:

[row, col] = find(A)

Best Answer

Related Solutions

MATLAB: How to use ind2sub in this problem

MATLAB: Obtain row and column indices of non-zero matrix elements

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