MATLAB: How to find the max value and location within a matrix

matrixscript

I am working with a 7783×1 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.

Best Answer

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

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MATLAB: Maximum position of element in a matrix

Pretty straightforward - the only complicating factor is that max only works down one dimension at a time, so you either have to call it twice or turn the matrix temporarily into a vector. Probably easiest is this:

M = rand(1000);
[maxVal, idx] = max(M(:));

idx is a linear index. If you want the row/column index then

[i, j] = ind2sub(size(M), idx);

MATLAB: Finding the contrast ratio of a grayscale image

Do you need loops, like this is a homework question that requires them? If not, just simply do

Imax = max(I(:))
Imin = min(I(:))
contrast = (Imax - Imin) / (Imax + Imin)

Notice that I'm using the correct formula. You are not. They subtract in the numerator, not divide like you have it.

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MATLAB: Maximum position of element in a matrix

MATLAB: Finding the contrast ratio of a grayscale image

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