getYTM <- function(bond ,bond.price = NULL, r = NULL)
{
if(is.null(bond.price))
{
if(!is.null(r)) bond.price = bondPrice(r,bond)
else bond.price = bond@price
if(length(bond.price)==0) stop("Nie podano ceny obligacji, ani stopy do jej obliczenia w YTM")
}
YTM <- function(ytm)
{
bondPrice(ytm,bond)-bond.price
}
uniroot(YTM,interval=c(0,1))$root
}
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