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

[Peter Dalgaard]

Peter Dalgaard wrote:
> 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
>
>   
Oops. Forgot this:

)

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