see inline. On Thu, Dec 16, 2010 at 10:11 AM, Ben Bolker <bbol...@gmail.com> wrote: > Alaios <alaios <at> yahoo.com> writes: > >> >> 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] >> > > Analytically or numerically? > It sounds like you want the answer analytically, in which case R > can't do it, but it is an easy integral > > g(x)*s(x) = 10*x^3-15*x^2+4*x-6 > indefinite integral = 10/3*x^4 -15/3*x^3 + 4/2*x^2 - 6*x + C > evaluate between a and b > > or if you can't do this (although this is a very basic integral) > you can try it on Wolfram alpha/the Mathematica integrator (google > for it)
Or a free software alternative: sage http://www.sagemath.org/ kjetil > > use ?integrate (surprisingly enough) for 1-D numerical integration > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.