change column in matrix

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

[Muruganandham Subramanian]

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

Answer 1

[Andrei Bobrov]

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,[])');

Answer 2

[Muruganandham Subramanian]

a=1:2250;
d=reshape(a,[75 30]);