Comparing two vectors with different dimensions

2012 6 14
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Hello,
How can you compare two vectors with different number of elements? I am just trying to find the equal elements. Thanks!

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the cyclist
the cyclist 2012-6-14

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Your question is fairly vague, but I have a feeling that either the ismember() command or the intersect() command will help you do what you want.

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osminbas
osminbas 2012-6-14
Sorry I wasn't clearer. And yes, intersect was what I was looking for. Thank you!

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Rohan Kale
Rohan Kale 2012-6-19

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Let a and b be two arrays(or vectors). L=length(a), M=length(b).Suppose L>M, pad_zero=L-M; now b=[b zeros(1,pad_zero)]; c=a-b; now you can find the indices of the zero elements excluding the last pad_zero elements. These are your desired indices. Hope it helps.

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the cyclist
the cyclist 2012-6-19
Uh ... isn't it a lot easier to just use [c ia ib] = intersect(a,b)?
Rohan Kale
Rohan Kale 2012-6-19
yes it is indeed, I was just trying out an alternative....

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