How can I find the max value and location within a matrix
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zachary laird
on 23 Jan 2021
Commented: zachary laird
on 23 Jan 2021
I am working with a 7783x1 matrix, and I am trying to find the max value & its location. But I need to do it in the script and not in the command window. I have the matrix data saved as a FILE.mat in the same folder.
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Accepted Answer
Image Analyst
on 23 Jan 2021
Try this, where m is your matrix
maxValue = max(m(:));
rows = find(m == maxValue); % Find all locations where m equals the max value of m
5 Comments
Image Analyst
on 23 Jan 2021
You did not change the names like I said. Leave the semicolon off line 17 and see what fields it shows in the command window and use that instead of m.
More Answers (1)
Adam Danz
on 23 Jan 2021
[maxval, idx] = max(M);
2 Comments
Image Analyst
on 23 Jan 2021
Only finds the FIRST occurrence, not all of them. See how I did it if you want to make sure you find all of them.
Adam Danz
on 23 Jan 2021
That's true, but I'd recommend using logical indexing rather than slowing it down with find()
maxval = max(M);
idx = M==maxval;
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