How to find maximum without duplicates?
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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.
5 个评论
Paolo
2018-6-3
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
2018-6-3
Paolo
2018-6-3
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
2018-6-3
采纳的回答
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;
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