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"Kronecker" of varying dimensions?

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MRC
MRC 2013-11-27
编辑： Azzi Abdelmalek 2013-11-27
Hi, I have a matrix A of dimension m x n and a vector b of natural numbers with dimension m x 1. I want to obtain a matrix C of dimension (b(1)+...+b(m)) x n by vertically stacking each A(i,:) b(i) times. For example:
A=[1 2 3; 4 5 6; 7 8 9];
b=[2; 1; 4];
I want to obtain
C=[1 2 3; 1 2 3; 4 5 6; 7 8 9; 7 8 9; 7 8 9; 7 8 9];
I cannot use loops.

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Azzi Abdelmalek
Azzi Abdelmalek 2013-11-27
编辑：Azzi Abdelmalek 2013-11-27
A=[1 2 3; 4 5 6; 7 8 9]
b=[2; 1; 4]
out=cell2mat(arrayfun(@(x) repmat(A(x,:),b(x),1),(1:size(A,1))','un',0))

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