change column in matrix

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Rica
Rica 2012-12-7
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 个评论
Muruganandham Subramanian
Muruganandham Subramanian 2012-12-7
编辑：Muruganandham Subramanian 2012-12-7
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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回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-12-7
编辑：Andrei Bobrov 2012-12-7
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
编辑：Muruganandham Subramanian 2012-12-7
a=1:2250;
d=reshape(a,[75 30]);

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