Repeat rows that start with a particular value

Question

Andre Munoz 2016-6-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/288303-repeat-rows-that-start-with-a-particular-value

评论： Andre Munoz 2016-6-8

Hi, I am trying to repeat a column in an array where all columns start with 1. Example, I want row 2 (1110100) to be repeated in rows where the second column contain 1. So this would apply to the first and last row.

   1     0     0     0     0     0
   1     1     0     1     0     0
   0     0     0     0     0     0
   0     0     0     0     0     0
   1     0     0     0     0     0

which I want to look like this

   1     1     0     1     0     0
   1     1     0     1     0     0
   0     0     0     0     0     0
   0     0     0     0     0     0
   1     1     0     1     0     0

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Answer 1

Image Analyst 2016-6-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/288303-repeat-rows-that-start-with-a-particular-value#answer_224779

在 MATLAB Online 中打开

Try this to find the rows that need repeating:

m = [...
   1     0     0     0     0     0
   1     1     0     1     0     0
   0     0     0     0     0     0
   0     0     0     0     0     0
   1     0     0     0     0     0]
rowsToRepeat = m(:, 2) == 1

We can't fully answer the question because you did not say where you want the repeated rows to go. Do you want to append them to the end? Do you want the repeated row to go right below it's original location?

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Andre Munoz 2016-6-8

Please can you help me again. Now I want to take the top row (0100000) and repeat this where there are zeros in the first column. I have tried my self but this does not work for me. Thanks

Andre Munoz 2016-6-8