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

Peter Dalgaard P.Dalgaard at biostat.ku.dk
Wed Aug 27 16:43:23 CEST 2008


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:

)

-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)              FAX: (+45) 35327907



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