[R] Numerical Integration in 1D

From: Max <mnevill_at_exitcheck.net>
Date: Fri, 07 Mar 2008 10:40:42 -0800

Dear UseRs,

I'm curious about the derivative of n!.

We know that Gamma(n+1)=n! So when on takes the derivative of Gamma(n+1) we get Int(ln(x)*exp(-x)*x^n,x=0..Inf).

I've tried code like

> integrand<-function(x) {log(x)*exp(x)*x^n}
> integrate(integrand,lower=0,upper=Inf)

It seems that R doesn't like to integrate for any n, and I was wondering if anyone knew a way around this?


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