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matlabreshape
Elnaz
Elnaz

Reputation: 233

How to rearrange this vector without a loop?

I have a vector A = 1:2*N. I want to rearrange its elements into another vector like this:

B = [A(1:2), A(N+1:N+2), A(3:4), A(N+3:N+4), ..., A(N-1:N), A(2*N-1:2*N)];

How can I implement this in Matlab most efficiently? without a loop?

Upvotes: 2

Views: 67

Answers (1)

Dan
Dan

Reputation: 45752

The following will work when N is even:

N = 4;
A = 1:2*N;

temp = permute(reshape(A,2,[],2), [1,3,2]);

B = temp(:)'

if N can be odd, I guess you could pad A with two NaNs and then remove the last two elements from B at the end? i.e. A(end+1:end+2) = NaN at the beginning and then B = B(1:end-2) at the end

Upvotes: 2

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