I guess what you have is

g <- function(x){ 2*x-3 }
s <- function(x){ 5*x^2+2 }

and what you want is

f<-function(x){ g(x)*s(x) }

integrate(f,a,b)

Try that and see if it works. If not (that is, if your actual g and s are
not as in the example), maybe you'll have to do this:

integrate(Vectorize(f),a,b)

On Thu, Dec 16, 2010 at 10:27 AM, Alaios <alaios@yahoo.com> wrote:

> Hello I have two function in R
> like
> g(x)=2x-3
> and s(x)=5x^2+2
>
> and I want to find the integrafl of the g(x)*s(x) inside the interval of
> [a,b]
>
> Could you please help me find the proper function?
>
> I would like to thank you in advance for your help
>
> Regards
> Alex
>
>
>
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>
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