How Detect duplicate value in each column and replace first value with zero?

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safaa
safaa 2017-4-1
评论： Stephen23 2017-4-2
For example
A = [ 5 3 2 5 1 3 1 1 2 2;
5 8 6 6 1 4 4 2 3 3;
7 9 9 7 4 8 10 6 4 7;
8 10 10 9 9 8 10 6 5 7];
In first column 5 duplicate and in five column 1 duplicate I want replace first duplicated values with 0
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the cyclist
the cyclist 2017-4-1
编辑：the cyclist 2017-4-1
I think they mean that the number 5 is duplicated in the first column, and that the number 1 is duplicated in the fifth column. (Similarly the number 8 is duplicated in the sixth column, and so on.)

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the cyclist
the cyclist 2017-4-1
If your values are always sorted, as in your example, then I believe this will compactly do what you want:
indexToDuplicates = [nan(1,size(A,2));diff(A)]==0;
A(indexToDuplicates) = 0;
You don't even have to split that into two lines, but I thought it might be clearer what I am doing. You could do
A([nan(1,size(A,2));diff(A)]==0) = 0;

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