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## absmax

version 1.0 (1.27 KB) by

Returns the value of the element with the largest absolute value in the input matrix.

Updated

Returns the value of the element with the largest abs value in the input matrix 'A'. Input 'A' must be numeric, but can be any size and shape.

This is useful because it eliminates iterating through all the dimensions of a matrix.

examples:
A=[-5 3 2 3; 3 2 1 4];
absmax(A) will return -5

A=[643,10];
absmax(A) will return 643

### Adam McNeilly (view profile)

Jan Simon's solution is more efficient.

W. Owen Brimijoin's solution returns a matrix when there is more than one max value.

Jan Simon

### Jan Simon (view profile)

Even more efficient than W.Owen Brimijoin's suggestion:

[dummy, index] = max(abs(A(:));
result = A(index);

Linear indexing beats the logical indexing here.

Owen Brimijoin

### Owen Brimijoin (view profile)

What about this alternate (and arguably simpler) means of solving the problem:

A(abs(A)==max(abs(A(:))))

Hooray for logical indexing!

##### MATLAB Release
MATLAB 8.1 (R2013a)
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