[R] built a lower triangular matrix from dataframe

[Rui Barradas]

Hello,

>
> 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
data.frame.
(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
y

Hope this helps,

Rui Barradas


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