MATLAB: About maximum value in matrix

largest elementmatrixmaximum value

I have a problem regarding finding a maximum value from my matrix (largest element in the row)
I have matrix A shown bellow
I know that I can use
M=max(A,[],2)
Then I will get matrix M such that
But the answer I want is not that, what I want is that . The one that I want is
The answer that I want is the maximum value of each row ignoring the negativity of each value like shown in the matrix above.
I hope my question is clear enough.

Best Answer

This can be done using sub2ind:
A = [2,4,-1,0,-1;1,3,12,-3,2;-12,2,4,0,-1;2,4,0,-5,-2;3,-4,-1,0,8]
[~,C] = max(abs(A),[],2); % C = column indices
S = size(A);
R = 1:S(1);               % R = row indices
X = sub2ind(S,R(:),C(:)); % X = linear indices
Z = A(X)
Giving
Z =
    4
   12
  -12
   -5
    8
It would be nice if max etc. could return the linear indices, but that is what we have to work with. Note that you can also calculate the linear indices yourself, without sub2ind:
X = S(1)*(C-1)+(1:S(2)).'
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