[R] Integrate a 1-variable function with 1 parameter (Jose L. Romero)

[Peter Dalgaard]

jose romero wrote:
> Hey fellas:
>
> I would like to integrate the following function:
>
> integrand <- function (x,t) {
> 	exp(-2*t)*(2*t)^x/(10*factorial(x))
> }
>
> with respect to the t variable, from 0 to 10.
> The variable x here works as a parameter: I would like to integrate the said function for each value of x in 0,1,..,44.
>
> I have tried Vectorize to no avail.
>
>   
Will this do?

sapply(0:44,function(x)integrate(integrand,x=x, lower=0, upper=10)$value

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