matrix step shift in each row

Question

mohammed hussein 2021-2-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/754099-matrix-step-shift-in-each-row

评论： mohammed hussein 2021-2-23

采纳的回答： Rik

HI

i have equestion about matrix shift numbers . for example i have this matrix

A =[ 1 2 3 4 5 ]

i want it to be

A =

1 2 3 4 5

5 1 2 3 4

4 5 1 2 3

3 4 5 1 2

2 3 4 5 1

thank you very much for helping

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Rik 2021-2-23

Do the numbers in A mean anything (e.g. the number of positions the corresponding row should be shifted), or are you simply asking about a row-wise circshift?

mohammed hussein 2021-2-23

yes , i have circle geometry , i want to shift the number in circle like the simple example that i asking about

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Answer 1

Rik 2021-2-23

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https://ww2.mathworks.cn/matlabcentral/answers/754099-matrix-step-shift-in-each-row#answer_631404

在 MATLAB Online 中打开

This method works without a loop.

A =[     1     2     3     4     5  ];
[X,Y]=ndgrid(1:numel(A));
X=X(end:-1:1,:);
ind=mod(X+Y,numel(A));
ind(ind==0)=numel(A);
A(ind)
ans = 5×5
     1     2     3     4     5
     5     1     2     3     4
     4     5     1     2     3
     3     4     5     1     2
     2     3     4     5     1

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mohammed hussein 2021-2-23

thank you very much . this exactly what i want

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Answer 2

Stephen23 2021-2-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/754099-matrix-step-shift-in-each-row#answer_631419

在 MATLAB Online 中打开

A = [1,2,3,4,5];
B = toeplitz(A([1,end:-1:2]),A)
B = 5×5
     1     2     3     4     5
     5     1     2     3     4
     4     5     1     2     3
     3     4     5     1     2
     2     3     4     5     1