How can I find the max value and location within a matrix

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.

Answer 1

[Image Analyst]

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

[zachary laird]

That worked in the command window but How do I use this when my matrix is in another .mat file. Like how do I reference that particular file? Thank you in advance

[Image Analyst]

Did you try putting it into a script where you have loaded your matrix? Something like

s = load('my data.mat');
m = s.m; % Extract matrix from structure.
maxValue = max(m(:));
rows = find(m == maxValue); % Find all locations where m equals the max value of m

Change the names(obviously) to whatever names you're using for your variables.

[zachary laird]

Its been about 5 years since I have touched matlab but here is a photo of what is happening. In the current folder is "pothole.mat". It was a text file that I imported into matlab and it converted it to a numerical matrix (7781x1) and saved as what is shown.

[Image Analyst]

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.

[zachary laird]

I see where I need to change the name now. Thank you for your help.

Answer 2

[Adam Danz]

[maxval, idx] = max(M);

[Image Analyst]

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]

That's true, but I'd recommend using logical indexing rather than slowing it down with find()

maxval = max(M);
idx = M==maxval;