[R] built a lower triangular matrix from dataframe

Rui Barradas rui1174 at sapo.pt
Wed Feb 15 18:02:16 CET 2012


> I'm trying to build a lower triangular matrix (with zeros in the diagonal)
> from a particular dataframe.

This example constructs a lower triangular matrix from a vector, not a
(In your example, you also use a vector, the last column of the DF.)

x <- runif(15)
y <- matrix(0, nrow=6, ncol=6)

y[lower.tri(y)] <- x

# See the result

Hope this helps,

Rui Barradas

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