Question: duplication matrix

I can't find in the Linear Algebra package the command for creating the duplication matrix.

The duplication matrix is the n * n rows and n * ( n + 1 ) / 2 columns that transforms vech(A)
to vec(A) where A is a symmetric n by n matrix (Magnus & Neudecker).

If it not yet in Maple itself, has someone already made a proc for it?

Harry Garst


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