find few elements in vector

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Kerim Khemraev
Kerim Khemraev 2016-11-15
评论： Kerim Khemraev 2016-11-16
Hi!
Let's assume that I have a vector y=[3 5 6 7 9] and x=[5 9] How can I get the indices of elements in 'y' that are equal to 'x' without using cycle? I mean if I had x=5 ('x' is a scalar) I would write something like y==x or find(y==x) but 'x' is a vector. Thank you in advance

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Geoff Hayes
Geoff Hayes 2016-11-15
Kerim - try using ismember or intersect to find those elements that are common to both arrays.

更多回答（2 个）

Roger Stafford
Roger Stafford 2016-11-15
[~,ia] = intersect(y,x);
ia contains indices with respect to y of elements that lie both in y and in x.
Kerim Khemraev
Kerim Khemraev 2016-11-16
Geoff Hayes, Roger Stafford Thank you a lot! intersect function solves my problem

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