change column in matrix

Rica (view profile)

on 7 Dec 2012

Hi!

is it possible in matlab to change coluns:

` A=[a1 a2 a3 a4.......a2250],a1...a2250 are arrays oth size(30*1).`
``` i want to get this matrix B=[a1 a75 a150.... a2 a76....a3 a77..... ].
that means i have a step of 74```

i wish you could help thank you

1 Comment

Muruganandham Subramanian

Muruganandham Subramanian (view profile)

on 7 Dec 2012

if you step size is 74..the matrix will be B=[a1 a75 a149 a223...] like this only.. check is your question is right?

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Andrei Bobrov (view profile)

on 7 Dec 2012
Edited by Andrei Bobrov

Andrei Bobrov (view profile)

on 7 Dec 2012
```B = reshape(permute(reshape(A,size(A,1),75,[]),[1 3 2]),size(A,1),[]);
```

or

```s = size(A,2);
B = A(:,bsxfun(@plus,1:75:s,(0:(s/75-1))')');
```

or

```B = A(:,reshepe(1:size(A,2),75,[])');
```

Muruganandham Subramanian (view profile)

on 7 Dec 2012
Edited by Muruganandham Subramanian

Muruganandham Subramanian (view profile)

on 7 Dec 2012
```a=1:2250;
d=reshape(a,[75 30]);
```