Move multiple rows without swapping

Question

Rishi Balasubramanian 2020-12-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/700947-move-multiple-rows-without-swapping

评论： Rishi Balasubramanian 2020-12-23

Hello,

I have a mxn matrix of binary data. I want to write a code where I find the rows in column n which have 1s in them and move them to bottom of the row. I want a generalised code for this as it will be in a loop where multiple iterations of this will be executed.

%For example, assume this is my matrix
%    a b c d e f g h i j k l
H = [0 0 1 1 0 1 0 1 0 1 1 0;  %1
     0 0 0 1 0 1 1 0 1 0 1 0;  %2
     0 1 1 0 0 1 1 1 0 0 0 1;  %3
     0 1 1 0 1 0 1 0 1 0 0 1;  %4
     0 0 0 1 1 0 0 1 1 0 0 0;  %5
     0 1 0 0 1 0 0 0 0 0 1 0]; %6
%In column 'l' there are 2 rows with 1s in them (row 3 and 4). 
% I want to move rows 3 and 4 to the bottom. My final matrix should look like this.
%    a b c d e f g h i j k l
H = [0 0 1 1 0 1 0 1 0 1 1 0;  %1
     0 0 0 1 0 1 1 0 1 0 1 0;  %2  
     0 0 0 1 1 0 0 1 1 0 0 0;  %5
     0 1 0 0 1 0 0 0 0 0 1 0;  %6
     0 1 1 0 0 1 1 1 0 0 0 1;  %3
     0 1 1 0 1 0 1 0 1 0 0 1]; %4
%Any help is appreciated. I thank in advance.

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Answer 1

Ive J 2020-12-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/700947-move-multiple-rows-without-swapping#answer_582697

在 MATLAB Online 中打开

H = randi([0 1], 6, 10)
H =
   1     0     1     1     0     0     0     1     0
   1     1     0     1     1     0     1     1     1
   0     0     0     1     0     0     1     0     1
   1     0     0     1     1     1     0     0     1
   1     0     0     1     1     1     1     0     0
   0     1     1     1     1     1     0     1     1
col = 9;
H = [H(H(:, col) < 1, :); H(H(:, col) > 0, :)]
   0     0     0     1     0     0     1     0     1
   1     0     0     1     1     1     0     0     1
   1     0     0     1     1     1     1     0     0
   1     0     1     1     0     0     0     1     0
   1     1     0     1     1     0     1     1     1
   0     1     1     1     1     1     0     1     1

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Rishi Balasubramanian 2020-12-23

Wonderful, that works perfectly. Thanks man.

Rishi Balasubramanian 2020-12-23

在 MATLAB Online 中打开

Hello, One more question. Hopefully its the last. Say I want to move a single row to a specific postion? How do I do that?

For ex

%    a b c d e f g h i j k l
H = [0 0 1 1 0 1 0 1 0 1 1 0;  %1
     0 0 0 1 0 1 1 0 1 0 1 0;  %2
     0 1 1 0 0 1 1 1 0 0 0 1;  %3
     0 1 1 0 1 0 1 0 1 0 0 1;  %4
     0 0 0 1 1 0 0 1 1 0 0 0;  %5
     0 1 0 0 1 0 0 0 0 0 1 0]; %6
% I want to move row 2 to row index 5 such that my final matrix is -
%    a b c d e f g h i j k l
H = [0 0 1 1 0 1 0 1 0 1 1 0;  %1
     0 1 1 0 0 1 1 1 0 0 0 1;  %3
     0 1 1 0 1 0 1 0 1 0 0 1;  %4
     0 0 0 1 1 0 0 1 1 0 0 0;  %5
     0 0 0 1 0 1 1 0 1 0 1 0;  %2
     0 1 0 0 1 0 0 0 0 0 1 0]; %6
     