shift a block of rows to the end of a matrix

Question

LH 2022-11-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1859588-shift-a-block-of-rows-to-the-end-of-a-matrix

评论： LH 2022-11-22

采纳的回答： Stephen23

在 MATLAB Online 中打开

Hi,

Suppose I have a matrix:

A = [0    0.2000;
  0.1578;
  0.0721;
       0;
       0;
2000     0;
3993     0;
4000     0;
5428     0;
6000     0];

and I need to shift all rows from the beginning until the first ( 0 0) to be put at the end of the matrix so it looks as:

A = [0         0;
2000     0;
3993     0;
4000     0;
5428     0;
6000     0;
  0.2000;
  0.1578;
  0.0721;
       0];

I understand that circshift could work, but a generic algorithm of how to do such a shift would be helpful for any matrix A of such form.

Any help would be appreicted.

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Answer 1

Stephen23 2022-11-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1859588-shift-a-block-of-rows-to-the-end-of-a-matrix#answer_1108328

在 MATLAB Online 中打开

A = [0,0.2;0,0.1578;0,0.0721;0,0;0,0;0.2,0;0.3993,0;0.4,0;0.5428,0;0.6,0]
A = 10×2
         0    0.2000
         0    0.1578
         0    0.0721
         0         0
         0         0
    0.2000         0
    0.3993         0
    0.4000         0
    0.5428         0
    0.6000         0
N = find(all(A==0,2),1,'first');
B = circshift(A,-N,1)
B = 10×2
         0         0
    0.2000         0
    0.3993         0
    0.4000         0
    0.5428         0
    0.6000         0
         0    0.2000
         0    0.1578
         0    0.0721
         0         0