How to return value of column not the index using find function?

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Ahmed Hamed
Ahmed Hamed 2016-4-30
评论： Ahmed Hamed 2016-4-30
I have a simple matrix
A=
1 3
4 2
2 1
3 3
5 2
I'd like to search for all values in the first column whose second column is 3
When i use
find(A(:,2)==3)
I returns the index not the value of the first column?
Is there any matlab function that can do this?
That in advance

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2016-4-30
编辑：Azzi Abdelmalek 2016-4-30
out= A(A(:,2)==3,1)
Also, with your code you found the indices
idx=find(A(:,2)==3)
The the result is
R=A(idx,1)

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