How can we insert a row matrix without altering the rest of the values?

Question

Ashfaq Ahmed 2022-12-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1869422-how-can-we-insert-a-row-matrix-without-altering-the-rest-of-the-values

评论： Ashfaq Ahmed 2022-12-2

采纳的回答： Dyuman Joshi

在 MATLAB Online 中打开

Hi!

Say, I have this matrix -

Now I want to add A*10 after each of the rows so that I can make this matrix -

I have hundreds of rows, so I would prefer a loop (or anything!)

Thank you for your help.

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Answer 1

Dyuman Joshi 2022-12-2

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https://ww2.mathworks.cn/matlabcentral/answers/1869422-how-can-we-insert-a-row-matrix-without-altering-the-rest-of-the-values#answer_1118417

编辑：Dyuman Joshi 2022-12-2

在 MATLAB Online 中打开

A = reshape(1:15,3,5)'
A = 5×3
     1     2     3
     4     5     6
     7     8     9
    10    11    12
    13    14    15
%pre-allocation
y=zeros(size(A,1)*2,size(A,2));
y(1:2:end,:)=A;
y(2:2:end,:)=A*10
y = 10×3
     1     2     3
    10    20    30
     4     5     6
    40    50    60
     7     8     9
    70    80    90
    10    11    12
   100   110   120
    13    14    15
   130   140   150

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Ashfaq Ahmed 2022-12-2

You are very intelligent! The algorithm is awesome!

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Answer 2

Fangjun Jiang 2022-12-2

3
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https://ww2.mathworks.cn/matlabcentral/answers/1869422-how-can-we-insert-a-row-matrix-without-altering-the-rest-of-the-values#answer_1118432

编辑：Fangjun Jiang 2022-12-2

在 MATLAB Online 中打开

A=magic(3);
C=transpose(reshape([A,10*A]',size(A,1),[]))
C = 6×3
     8     1     6
    80    10    60
     3     5     7
    30    50    70
     4     9     2
    40    90    20