caplet <-
function(fwd, strike, v, r, t0, t1, N=1, rate_type="nominal"){
#t0: maduracion de la opcion.
#t1: fecha de pago del contrato.
#t1-t0: Prediodo de la tasa subyacente.
#r: Tasa hasta el pago de la opcion.
r_c=r
if (substr(rate_type, 1, 1) == "n") {
r_c = log(1 + r * t)/t
}
if (substr(rate_type, 1, 1) == "e") {
r_c = log(1 + r)
}
if (length(t1)!=length(t0)){
stop("Longitud de t0 es diferente a la longitud de t1")}
d1 = (log(fwd/strike) + (v^2/2) * t1)/(v * sqrt(t1))
d2 = d1 - v * sqrt(t1)
price = N*(t1-t0)*exp(-r_c * t1) * (fwd*pnorm(d1) - strike * pnorm(d2))
return(price)
}
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