Minimum y-value in each column

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Hg
Hg on 20 Oct 2015
Edited: Thorsten on 20 Oct 2015
How to find the first y value (in red) efficiently in each column of the image below?

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Accepted Answer

Thorsten
Thorsten on 20 Oct 2015
Edited: Thorsten on 20 Oct 2015
[~,idx] = max(X);
Note that this returns 1 for columns that are all zero.

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