Generating a huge vector.

I'm trying to make a huge vector of 1x115200000. 1 to 76800 will be the number 1, 76800 to 153600 will be the number 2, till it reached number 1500.

Answer 1

[the cyclist]

M = 1500;
N = 76800;

x = reshape(repmat(1:M,N,1),1,M*N);