How to repeat each elements of matrix irregularly

Question

Jenjen Ahmad Zaeni 2021-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/840915-how-to-repeat-each-elements-of-matrix-irregularly

评论： Jenjen Ahmad Zaeni 2021-5-28

Hello everyone, i have a matrix like:

A =
    0.2978   -0.7649   -2.8475    3.4084

And i want to repeat the elements of matrix but differently for each element. For example, i want to repeat 0.2978 two times, -0.7649 three times, -2.8475 two times, and 3.4084 four times. So it will look like:

B =
    0.2978    0.2978   -0.7649   -0.7649   -0.7649   -2.8475   -2.8475    3.4084    3.4084    3.4084    3.4084 

What is the way to do that? Thank you.

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Answer 1

Sulaymon Eshkabilov 2021-5-27

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https://ww2.mathworks.cn/matlabcentral/answers/840915-how-to-repeat-each-elements-of-matrix-irregularly#answer_710075

在 MATLAB Online 中打开

Hi,

This is an easy solution to your exercise. You can adjust it w.r.t your exercise conditions:

A =[0.2978   -0.7649   -2.8475    3.4084];
 AA=[];
 for ii = 2:numel(A)
     AA = [AA, repmat(A(ii-1), 1, ii)];
 end
 

Good luck.

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Jenjen Ahmad Zaeni 2021-5-28

Works for me. Thank you very much.

Sulaymon Eshkabilov 2021-5-28

Most welcome!!!

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Answer 2

Image Analyst 2021-5-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/840915-how-to-repeat-each-elements-of-matrix-irregularly#answer_710105

在 MATLAB Online 中打开

Use repelem():

A =[0.2978   -0.7649   -2.8475    3.4084]
B = repelem(A, [2 : length(A) + 1])

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Image Analyst 2021-5-28

编辑：Image Analyst 2021-5-28

Wow, about time to upgrade. There has been so many improvements in the last 7 years as you can imagine. You can edit the release even after you post you know. I've done it for you this time.

Jenjen Ahmad Zaeni 2021-5-28

Haha yeah. So many improvement that make things easier. When i installed it, i have less memory of HDD so i installed the older release instead. Oh yes, my bad, i didn't look for it. Anyway, thank you very much.

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