Find given element in column 1 with "find" function.

2015 7 24
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Hello all, I am trying to use "find" function and I want to find the given number in 1st column only. For example if I have a matrix A= [ 1 1 3;1 2 3;1 2 1]; and I want to find 1's in column 1 by using P=find(A==1). My ans is P= [1;2;3;4;9] which are the indexes of 1. I want only 1st column output which should be [1;2;3]. Please help if you have any idea. Thank you.

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bio lim
bio lim 2015-7-24
编辑：bio lim 2015-7-24

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A = [ 1 1 3;1 2 3;1 2 1];
P = find(A(:,1)==1);

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