Convert a number to its binary representation (not string) as 1D Vector

[Muthiah Annamalai]

Hello there,
I have a nice function Im writing, for which a hard part for me
is to convert a number to its binary representation as 1D Vector
of 1's & 0's. Now Im doing this using a while loop and appending
to the vector, which seems to throw speed into the trashcan; 
any and all suggestions welcome.

Thanks in advance,
-Muthu


-- 
Muthiah Annamalai,
Graduate Student,
Department of Electrical Engineering,
University of Texas, Arlington.