Matlab: duplicating each row of a matrix [duplicate]

Question

I have a matrix and I want to duplicate each row n times, such that each row is consecutively stacked n times.

So basically if

n = 2

then my matrix

A = [1 2 3; 4 5 6; 7 8 9]

should become

B = [1 2 3; 1 2 3; 4 5 6; 4 5 6; 7 8 9; 7 8 9] .

Thanks in advance.

Community · Accepted Answer · 2017-05-23 11:58:59Z

This question has been asked quite a few times before, for instance here, here and here (from today) .

Some solutions:

kron(A,ones(n,1)) ans = 1 2 3 1 2 3 4 5 6 4 5 6 7 8 9 7 8 9

Another one:

reshape(repmat(A(:)',n,[]),[],3);

And one more:

B = A(ceil((1:size(A,1)*n)/n),:)

Take your pick!

1 Answer 1