[R] built a lower triangular matrix from dataframe

Rui Barradas rui1174 at sapo.pt
Thu Feb 16 17:22:25 CET 2012


I'm glad it helped.

The difference in the ordering is due to the fact that R defaults to
column-first ordering.
David's solution uses row-first  (which is what you wanted).

Rui Barradas

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