[R] Integrate two function in R
David Winsemius
dwinsemius at comcast.net
Thu Dec 16 14:30:48 CET 2010
On Dec 16, 2010, at 7:27 AM, Alaios 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?
It depends on what you are doing:
None of what appears below is valid R code. Finding the closed form
expression for the integral of a third degree polynomial evaluated at
a and b would be a simple first semester calculus problem. It's not
clear why you are using R for this.
And if someone has posed this to you as a homework problem in hopes
that you will find a way to get a polynomial solution in terms of a
and b then you need to look at the RYacas package. R has some limited
symbolic differentiation tools but I do not remember seeing any
symbolic integrations within R.
So if you were think of using not a and b but rather specific numbers
for a numeric solution, then the integrate function is the obvious
choice. If you don't understand what the help page for "integrate"
says, then perhaps you should explain at what point you are getting
stuck. Bring code next time.
>
> I would like to thank you in advance for your help
>
> Regards
> Alex
David Winsemius, MD
West Hartford, CT
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