How to return the rows with specific value?

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Ahmed Hamed
Ahmed Hamed 2016-4-30
回答： Azzi Abdelmalek 2016-4-30
I have a simple matrix
X =
0 1 2
1 1 2
2 2.5 4.5
3 2 2
4 4 1.5
5 4 2.5
and another matrix
out = [3;4]
I'd like to return the rows in X whose rows start with any value in out
The output should look like
3 2 2
4 4 1.5
I tried this code
xx= X(X(:,1)==any(out),:)
but this always return the first row.
Any suggestion please Thanks in advance

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2016-4-30
Y=X(ismember(X(:,1),out),:)

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