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How to perform repmat function to repeat rows of a matrix

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Zee
Zee 2022-8-19
回答： Bruno Luong 2022-8-19
A=[1,0,0,0,1;2,0,0,0,2;3,0,0,0,3]
I would like to repeat each row for n times and get output something like this when n is 2:
output=[1,0,0,0,1;1,0,0,0,1;2,0,0,0,2;2,0,0,0,2;3,0,0,0,3;3,0,0,0,3]

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采纳的回答

Bruno Luong
Bruno Luong 2022-8-19
Ran in:
A=[1,0,0,0,1;2,0,0,0,2;3,0,0,0,3]
A = 3×5
1 0 0 0 1 2 0 0 0 2 3 0 0 0 3
A(repmat(1:end,2,1),:)
ans = 6×5
1 0 0 0 1 1 0 0 0 1 2 0 0 0 2 2 0 0 0 2 3 0 0 0 3 3 0 0 0 3

更多回答（5 个）

Torsten
Torsten 2022-8-19
编辑：Torsten 2022-8-19
B = repelem(A,2,1)
  2 个评论
Zee
Zee 2022-8-19
Hi, cannot use this function since it got introduced in 2015 version, I am using 2011 version. Thanks.
Torsten
Torsten 2022-8-19
编辑：Torsten 2022-8-19
Ran in:
A = [1,0,0,0,1;2,0,0,0,2;3,0,0,0,3];
n = 2;
B = [];
for i = 1:size(A,1)
B = [B;repmat(A(i,:),n,1)];
end
B
B = 6×5
1 0 0 0 1 1 0 0 0 1 2 0 0 0 2 2 0 0 0 2 3 0 0 0 3 3 0 0 0 3

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Bruno Luong
Bruno Luong 2022-8-19
Ran in:
A=[1,0,0,0,1;2,0,0,0,2;3,0,0,0,3]
A = 3×5
1 0 0 0 1 2 0 0 0 2 3 0 0 0 3
reshape(repmat(reshape(A,1,1,[]),2,1,1),[],size(A,2))
ans = 6×5
1 0 0 0 1 1 0 0 0 1 2 0 0 0 2 2 0 0 0 2 3 0 0 0 3 3 0 0 0 3
Bruno Luong
Bruno Luong 2022-8-19
n = 2;
A(ceil((1:n*end)/n),:)
Bruno Luong
Bruno Luong 2022-8-19
n = 2;
A(kron(1:end,ones(1,n)),:)
Bruno Luong
Bruno Luong 2022-8-19
n = 2;
kron(A,ones(n,1))

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