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"expanding a list"


Greetings,

I'd like to construct a list as follows. Say I have a list of reals  
{x1,x2,x3,...xn}, and another list of integers {r,s}. I'd like to  
make a new list

{{x1,x1,x1,...},{x2,x2,x2....},{x3,x3,x3,...},....,{xn,xn,xn,...}},  
where the first sublist is of length r, and the remaining sublists  
are of length s.


Thanks,

-Mark




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