How do I repeat a row a certain number of times?

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Joanne Tamayo
Joanne Tamayo 2016-4-6
评论： Jesse Ivers 2023-7-26
I have a vector of numbers. i.e [ 1 2 3 4] I want to repeat that specific vector a certain number of times, to make a matrix of x rows. It's just the first row repeating itself x times. So it would be [ 1 2 3 4; 1 2 3 4; 1 2 3 4] If x was 3. However I cannot use repmat nor use an iteration
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jgg
jgg 2016-4-6
编辑：jgg 2016-4-6
Why can't you use those functions? Is this homework? The trick is pretty easy:
v = [1:5];
v = v(ones(1,1000),:);
where x = 1000 here.

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回答（1 个）

sam0037
sam0037 2016-4-11
Hi,
This can be also done using the REPELEM command as follows:
v = [1:4];
repelem(v,[3],[1])
Follow the link below to know more about this function:
http://www.mathworks.com/help/matlab/ref/repelem.html
  2 个评论
Madhav Malhotra
Madhav Malhotra 2021-4-20
编辑：Madhav Malhotra 2021-4-20
@sam0037Could you please explain how the second and third arguments in your function work?
The documentation doesn't provide an example of what happens when you put one-dimensional vectors as arguments to repelem.
Jesse Ivers
Jesse Ivers 2023-7-26
They don't have to be vectors, simple ints accomplish the same goal. Not sure why they are bracketed in that example.

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