[R] pmt

[statfan]

I am working with the pmt function in the {mnormt} package, and i am getting
negative values returned.  the following is an example of one of my outputs:

pmt(x = c(3.024960, -1.010898), mean = c(21.18844, 21.18844), S =
matrix(c(.319,.139,.139,0.319), 2, 2),df = 42)
# -6.585641e-18

Any help on why i'm getting negative numbers would be very much appreciated.

THanks!

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