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andrr
2010 Aug 25
4
Secant Method Convergence (Method to replicate Excel XIRR/IRR)
...ms to only converge when my initial guess is very close to the correct IRR.
Maybe I have some basic errors in my coding/logic? Any help would be greatly appreciated.
The Wikipedia article to secant method and IRR: http://en.wikipedia.org/wiki/Internal_rate_of_return#Numerical_solution
Thanks!
ANXIRR <- function (cashFlow, cfDate, guess){
cfDate<-as.Date(cfDate,format="%m/%d/%Y")
irrprev <- c(0); irr<- guess
pvPrev<- sum(cashFlow)
pv<- sum(cashFlow/((1+irr)^(as.numeric(difftime(cfDate,"2010-08-24",units="days"))/3...