insert rows and columns in a matrix

Question

Rakesh Belchandan 2019-11-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/491445-insert-rows-and-columns-in-a-matrix

评论： Star Strider 2019-11-16

采纳的回答： Star Strider

Hello,

I have a 3x3 matrix and I want to make it 4x4 matrix by inserting a row and column of zero elements. How can I do that?

Thanks,

Rakesh

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Answer 1

Star Strider 2019-11-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/491445-insert-rows-and-columns-in-a-matrix#answer_401820

在 MATLAB Online 中打开

One approach:

M = rand(3);
Mz = zeros(size(M,1)+1, size(M,2)+1);
Mz(1:size(M,1), 1:size(M,2)) = M;

producing (here):

Mz =
      0.95717      0.14189      0.79221            0
      0.48538      0.42176      0.95949            0
      0.80028      0.91574      0.65574            0
            0            0            0            0

Experiment to get the result you want.

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Rakesh Belchandan 2019-11-16

Oh great.. I can just chnage rows and columns in your solution. Thanks.

Star Strider 2019-11-16

在 MATLAB Online 中打开

My pleasure.

That was not part of your original Question!

Just exchange the various rows and columns:

Mz([1 2 4 3],[1 2 4 3]) = Mz

producing for the original ‘Mz’:

Mz =
      0.34039      0.75127      0.69908            0
      0.58527       0.2551       0.8909            0
      0.22381      0.50596      0.95929            0
            0            0            0            0

and the ‘shuffled’ ‘Mz’:

Mz =
      0.34039      0.75127            0      0.69908
      0.58527       0.2551            0       0.8909
            0            0            0            0
      0.22381      0.50596            0      0.95929

Experiment to get the result you want.

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