Are there any R packages available that have some form of function that can calculate IRR based on uneven payments on specific dates for a lump sum distribution.

Example:

df <- data.frame(date = c(as.Date("2010-1-24"), as.Date("2011-5-6"), as.Date("2012-3-24")), pmts=c(-2000,-1000,-800))
today <- as.Date("2012-7-25")
lumpsum <- 4580

I'm looking for an easy way to calculate the rate of return of $4580 received today in exchange for the payment schedule defined above.

Thanks in advance, --JT

r finance
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