## How can I vectorize for loop with randsample

on 13 Oct 2012

### Walter Roberson (view profile)

I like to know if there is a any simpler way of doing this (without for-loop):

`    A = zeros(4,3)   %this size is just an example`
`    for i=1 : 4      %I want to add 4 vectors ...`
`      A(i,:) = randsample(7,3)'  %... which are 3 different numb from [1-7]`
`    end`
`    A =`
```       4     6     2
1     7     3
2     1     5
3     5     6```

So my point is to create a matrix from different vectors, which I have created with randsample. Is there a way I can vectorize this?

Have been fighting with this many days :)

Yours Merit

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### Walter Roberson (view profile)

on 13 Oct 2012
Edited by Walter Roberson

### Walter Roberson (view profile)

on 13 Oct 2012
```numvecs = 4;
popsize = 7;
numselected =3;
```
```[junk, randidx] = sort(rand(numvecs, popsize), 2);  %sort along row
A = randidx(:,1:numselected);
```

Andrei Bobrov

on 13 Oct 2012

+1

Merit

### Merit (view profile)

on 13 Oct 2012

Thank you Walter, just what I needed :)

Merit

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