[R] built a lower triangular matrix from dataframe

[nymphita]

Sorry, I just realized that it's not a lower triangualr matrix, but an upper
triangular matrix!
But still the solution/s should be rather similar in both cases.

http://r.789695.n4.nabble.com/file/n4391127/matrix2.png 

I apologize for creating confusion...
Nymphita

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