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Fastest way to create N by 1 matrix which contain lots of zero without using for loop

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Jinsu Kim
Jinsu Kim on 12 Oct 2018
Commented: Jinsu Kim on 12 Oct 2018
I want to express n x 1 matrix, X
X = [ a; a; a; a; b; 0; 0; 0; b; 0; 0; 0; (...) b; 0; 0; 0; b; 0; 0; 0; c; c; ] ("b; 0; 0; 0;" block is repeated N times)
What I first design is that:
A = a * ones(4,1) ; B = zeros(4,1); B(1) = b ; C = c * ones(2,1); X = [ A ; B ; B ; (...) B ; B ; C ] ;
But the problem is that I cannot set a number of center block. How can I code it?
Thanks in advance :D

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