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Stacking of vectors to form a column vector

Olufemi Bolarinwa 
Hello,I am estimating a system of nonlinear equation where I need to stack my vector of y. I have data of about 6000units. I tried using the rbind but instead of having a vector of 1 by 18000, it is giving me a 3 by 6000 so that my matrix multiplication is non-conformable. The stack command requires an identifier but in this case, I do not have a unique identifier.
I would like to stack the the first 6000 units of y1 on the 2nd 6000 units of y2 and 6000 units of y3.
Any help will be greatly appreciated.
ThanksOlufemi

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