CODEWITHSUNDEEP
matlab
William Napier
William Napier

Reputation: 27

Finding coordinates of maximum values of a matrix

I'm trying to find a way to find the sets of coordinates of the maximum value/s in a matrix of size [8,8], where the values in the matrix vary from 0 to 6 (generated through the rest of the script/function).

i.e. a matrix of zeros(8,8) where the value 1 is in [3,3], [3,5] and [5,3]. and I want to get returned something along the lines of ([3,3],[3,5],[5,3]) I have tried using things such as ind2sub, etc but with no luck (I keep getting things returned like [I,J] = [ [0,0,3,0,5,0,0,0] , [1,1,1,1,1,1,1,1] ])

Any ideas? If more clarification is needed, just point out where you need it and I'd be glad to do so.

Upvotes: 1

Views: 6446

Answers (1)

paddy
paddy

Reputation: 63451

The problem you've been having with max so far is because it operates on one dimension. If you call it on a matrix, using its default parameters, it will return a single maximum element (and indices) for each column of the matrix. In your case, you want all maximums, and the global maximum at that.

Try this:

[I,J] = find(M == max(M(:)))

First, max(M(:)) finds the maximum element, then we construct a logical matrix M == max(M(:)) showing which elements are the maximum. Finally, you can use find to get the co-ordinates of those (if necessary).

Upvotes: 3

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