[R] using a loop with an integration

[piltdownpunk]

Hi, all. 

I've written a function that returns the survival function for a Gompertz
mortality model.  I've specified the two model parameters.  Using a simple
integration, I can calculate the life expectancy at any age.  Is there a way
I can use a loop with the integration that will quickly return life
expectancy over a range of ages, say 0 to 80, so that I don't have to
manually type in the age in which I'm interested?  Please see the code
below.  Thanks so much.

--Trey

hk.bothsex_Gompsurv <- function (t)
	{
		x=c(0.02342671, 0.05837508)
		a3<-x[1]
		b3<-x[2]
		shift<-15
		
		S.t<-exp(a3/b3*(1-exp(b3*(t-shift))))
		return<-S.t
}
integrate(hk.bothsex_Gompsurv,0,Inf)$value/hk.bothsex_Gompsurv(0)	# life
expectancy at birth (change lower limit of integral and corresponding "t" in
denominator to calculate life expectancy at any age

-----
Trey Batey---Anthropology Instructor
Division of Social Sciences
Mt. Hood Community College
Gresham, OR  97030
Alt. Email:  trey.batey[at]mhcc[dot]edu
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