Repeating elements of an array

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daniel adams
daniel adams on 3 Dec 2021
Answered: Dave B on 3 Dec 2021
Say for some . How can I create an array of size which is just i.e repeat the elements of x M times each in a row.
Note I have tried using the reshape function but cant work out how to do it in this case.
  1 Comment
James Tursa
James Tursa on 3 Dec 2021
What have you done so far? What specific problems are you having with your code?

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Answers (1)

Dave B
Dave B on 3 Dec 2021
There are two really useful repeat functions: repmat and repelem
repelem is good for repeating an element n times, so I think this is what you want. Here I repeat the numbers in a 3 times each:
a=[1 3 7 9];
repelem(a,3)
ans = 1×12
1 1 1 3 3 3 7 7 7 9 9 9
repmat is good when you want to repeat an array of elements, here I repeat a itself 3 times in the row dimension, and 2 times in the column dimension:
repmat(a,3,2)
ans = 3×8
1 3 7 9 1 3 7 9 1 3 7 9 1 3 7 9 1 3 7 9 1 3 7 9

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