## How to compare two vectors with numbers?

Asked by Xin CUI

### Xin CUI (view profile)

on 21 Jun 2013
Accepted Answer by Vishal Rane

### Vishal Rane (view profile)

I have a question. I have two vectors A and B, both have a bunch of numbers. A is master and B is slave. Now what I want is to search each number in A and check if it's one of numbers in B (numbers in B is unique). If a number in A is also in B, label the position of that number in A as 1, and 0 otherwise, just like a logical comparison. Is there a command or a few lines to do this? Thanks in advance.

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### Vishal Rane (view profile)

Answer by Vishal Rane

on 21 Jun 2013

try ismember

Xin CUI

### Xin CUI (view profile)

on 21 Jun 2013

Great. thank you.

### Wayne King (view profile)

Answer by Wayne King

### Wayne King (view profile)

on 21 Jun 2013

```A = randi(10,10,1);
B = 1:5:50;
[IA,IB] = ismember(A,B);
```

Xin CUI

### Xin CUI (view profile)

on 21 Jun 2013

Thanks a lot. Very handy.

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