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export specific information of a matrix into a new matrix in desired format

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Homayoon
Homayoon 2015-6-22
评论： Star Strider 2015-6-22
Dear All, I have a matrix in the following form:
1 0 0 1
2 1 0 0
3 0 0 0
4 0 0 0
5 1 0 0
the matrix is huge but has only four columns. What I basically need to have is a code to focus on the second column of the matrix and whenever the element on the second column is equal to 1, the associated row corresponding to that element will be reported in a different matrix. For the above example, the desired output must be:
2 1 0 0
5 1 0 0
I tried to write a code using [counts, bins]=hist, but it failed. I am so thankful of your kindness. All the best, HRJ

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Star Strider
Star Strider 2015-6-22
This works:
A = [1 0 0 1
2 1 0 0
3 0 0 0
4 0 0 0
5 1 0 0];
B = A(A(:,2) == 1, :)
where ‘B’ is the output matrix.

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