Vector Manipulation into a matrix?

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Daniel Tanner
Daniel Tanner 2020년 3월 13일
댓글: Daniel Tanner 2020년 3월 13일
I have a vector, A, of dimensions 21-by-1. How would I be able to manipulate this matrix such that:
A = [a;b;c;d;e;f;g;h;i;...]
Becomes a 3-by-7 matrix, B:
B = [c,b,a;f,e,d;i,h,g,...]
Any help would be much appreciated! Thanks.

채택된 답변

Sriram Tadavarty
Sriram Tadavarty 2020년 3월 13일
Hi Daniel,
This can be solved by first using the reshape function and then performing the circular shift operation.
% Suppose the vector is a - of length 21
a = rand(21,1); % random column vector 21-by-1
% Now use the reshape operation to the desired size
aReshape = reshape(a,3,7); % Size is 3-by-7
% Store the first row in a variable
temp = aReshape(1,:);
% Replace the first row with the third row
aReshape(1,:) = aReshape(3,:);
% Replace the third row with the first row
aReshape(3,:) = temp;
out = aReshape;
The documentation link for the reshape function is
Hope this helps.
Regards,
Sriram
  댓글 수: 1
Daniel Tanner
Daniel Tanner 2020년 3월 13일
Thank you Sriram, very informative answer and much more understandable now!

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추가 답변 (1개)

Fangjun Jiang
Fangjun Jiang 2020년 3월 13일
A=(1:21)';
temp1=reshape(A,3,[]);
temp2=temp1';
B=fliplr(temp2)

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