Find Vector of Index Without Using Loop

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czeslaw
czeslaw 2018-4-27
回答： Akira Agata 2018-4-27
Hi all,
If I have
a=[2 3 4 5]
b=[3 5]
%what I want is the index of same elements between a and b, which gives:
i=[2 4]
I want to do this without having to use any loop, because the data is hundreds of thousands elements. Using find() will require me to use loop I think.
Please help. Thanks.

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Akira Agata
Akira Agata 2018-4-27
Please try ismember function, like:
[~,idx] = ismember(b,a);

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