[R] built a lower triangular matrix from dataframe

nymphita sandrablazquezcabrera at gmail.com
Thu Feb 16 12:04:42 CET 2012

Hi again,

I just realized that in this solution there is something funny on the
position the values in the matrix, they don't really correspond to the
position indicated in the subscripts... However, David Winsemius has given a
valid solution.
Thank you for all your ideas!

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