How to select columns in a matrix whose first row data is positive?

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Misi 2022-7-21

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评论： Misi 2022-7-21

采纳的回答： John D'Errico

Greetings

I have this matrix:

A=[-1 2 5 4 -4;1 2 3 4 6]

I want to extract the data according to first row. Indeed, I want to extract the columns with positive data in the first row, for example for the above matrix I am searching for a code to give me the below matrix

ans=[2 5 4;2 3 4]

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采纳的回答

John D'Errico 2022-7-21

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Easy peasy.

A=[-1 2 5 4 -4;1 2 3 4 6]
A = 2×5
    -1     2     5     4    -4
     1     2     3     4     6
B = A(:,A(1,:) > 0)
B = 2×3
     2     5     4
     2     3     4