As a minor plug for my favorite non stat-based mathematics software, sagemath also has a rudimentary R interface built-in -------------------------------------- Jonathan P. Daily Technician - USGS Leetown Science Center 11649 Leetown Road Kearneysville WV, 25430 (304) 724-4480 "Is the room still a room when its empty? Does the room, the thing itself have purpose? Or do we, what's the word... imbue it." - Jubal Early, Firefly
r-help-boun...@r-project.org wrote on 12/16/2010 09:11:33 AM: > [image removed] > > Re: [R] Integrate two function in R > > Kjetil Halvorsen > > to: > > Ben Bolker > > 12/16/2010 09:13 AM > > Sent by: > > r-help-boun...@r-project.org > > Cc: > > r-help > > 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. ______________________________________________ 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.