How to find maximum without duplicates?

I have the matrix, A = [1 2 1 0 0 2; 2 1 4 2 0 0; 1 1 0 2 1 1; 1 1 0 1 4 2] I understand that max(A) gives the maximum for each column,but how do I create a logical array locating the maximum of each column? If there is a tie, I just want to consider the first occurrence of the maximum.

[Paolo]

By 'tie' you refer to the case where the same max value appears twice in the column? As is the case for number 2, in columns 4 and 6 of your example?

[Zev Hirt]

yeah

[Paolo]

I'm not sure I understand though, how can you find the max if you do not compare all values?

If the output of max(A) is

 2     2     4     2     4     2

What is your desired output for matrix A?

[Zev Hirt]

I edited the question. For example, if I do A == max(A), I will have a logical one twice in column 4 and 6.

[Zev Hirt]

My ultimate desired output is the value of the row of the maximum value in each column of A.

Answer 1

[Jan]

A        = [1 2 1 0 0 2; 2 1 4 2 0 0; 1 1 0 2 1 1; 1 1 0 1 4 2];
[v, ind] = max(A, [], 1);

Now ind is the row index of the first maximum value per column.

And a "logical array locating the maximum of each column":

siz = size(A);
L   = false(siz);
L(sub2ind(siz, ind, 1:siz(2))) = true;