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VectorToMatrix


I want to define a function VectorToMatrix[list_, n_] that behaves as 
follows:

VectorToMatrix[{a,b,c,d,e,f,g,h,i,j}, 4]//MatrixForm

0 a b c d
0 0 e f g
0 0 0 h i
0 0 0 0 j

Now n can be determined from Length[list], which will always be equal to 
n choose 2 for some n.  But I would rather input n to save that 
computation.  (I will be doing this for a lot of vectors.)

Any ideas?

Rob Pratt
Department of Mathematics
The University of North Carolina at Chapel Hill
CB# 3250, 331 Phillips Hall
Chapel Hill, NC  27599-3250

rpratt at math.unc.edu



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