Coordinates of max in multidimensional arrays

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Anita 2011-5-31

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Dear Experts,

May I have some help? Being a beginner I got stocked with finding the coordinates of max values in a 3-dimensional array with respect to the 3rd dimension. I am trying to do this:

IND=max(val,[],3);

s=[2,61,1500];

[i,j,g]=ind2sub(s,IND)

where val is the original 3-D array and s is the size of val. For this I got the following error message:

??? Error using ==> rem Arguments must be real.

Error in ==> ind2sub at 35 vi = rem(ndx-1, k(i)) + 1;

I don't really see what should I do and I would very much appreciate any ideas...

thanks in advance.

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Answer 1

Walter Roberson 2011-5-31

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在 MATLAB Online 中打开

[themax,IND] = max(val,[],3);

That is, you were getting the maximum itself instead of its index.

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Anita 2011-5-31

thanks Walter, it is working now.

Anita 2011-6-1

May I have one more question? I got kind of a strange answer so I might have misunderstood what max with respect to a dimension means. May val matrix was generated by looping through the 3 dimensions, and what I need is to get the index of the max value in the matrix with respect to the 3rd dimension for each combination of the first two dimensions. This is like where is the max in each of 3rd-dim-"column", ie. for dim1=1 and dim2=1, for dim1=1 and dim2=2, etc. However, this command does something else because I don't get back my first-2-dim-combination indices going 1-by-1. What did I do wrong?

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