Finding multiple locations in a vector

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Bran
Bran 2015-10-5
回答： Image Analyst 2015-10-5
I was hoping someone could help, I am trying to use the find function to give me the location of the values of a vector in a larger vector.
ie
[a,b] = find(A==B);
where A is 300 by 1 and B is 20 by 1 but obviously I get an error because B is not a single value. Is there another function that I can use?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2015-10-5
编辑：Azzi Abdelmalek 2015-10-5
a=ismember(A,B)
b=find(a)
Image Analyst
Image Analyst 2015-10-5
You can use ismember() as long as they're integers or powers of two. If they're weird floating point numbers, see the FAQ: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

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