repeating elements of a vector in a certain manner

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Mnr 2016-2-23

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https://ww2.mathworks.cn/matlabcentral/answers/269505-repeating-elements-of-a-vector-in-a-certain-manner

回答： Star Strider 2016-2-23

Hello all, I have a vector A of length n. I would like to create a new vector B which contains each element of A repeated m times; i.e. length of B is mxn. For example, let A=[2 4 5 7 8]; m=3; then, B=[2 2 2 4 4 4 5 5 5 7 7 7 8 8 8]; What is the fastest way of doing that? Thanks!

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Answer 1

Star Strider 2016-2-23

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Two options, both producing the same output:

A=[2 4 5 7 8];
B1 = repelem(A,3)                                % Introduced in R2015a
B2 = reshape(repmat(A, 3, 1), [], 1)'
B1 =
     2     2     2     4     4     4     5     5     5     7     7     7     8     8     8
B2 =
     2     2     2     4     4     4     5     5     5     7     7     7     8     8     8