Re: Series
- To: mathgroup at smc.vnet.net
- Subject: [mg42764] Re: Series
- From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
- Date: Fri, 25 Jul 2003 05:08:09 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Recall the recent thread about how to take a power series in two variables and truncate it so the sum of exponents in each term does not exceed some integer. The programming needed to do this is a bit tricky for some users. So I wrote a TrucatedSeries package and posted it at http://library.wolfram.com/infocenter/MathSource/4950/ Notice with my package we can get a TruncatedSeries about {x0,y0}={0,1} or {x0,y0,z0}={0,1,0} or even {x0,y0}={Infinity,0} as follows: TruncatedSeries[ Exp[x y]Log[y], {x,0}, {y,1}, 3 ] TruncatedSeries[ Exp[x y]Log[y]/(z-1), {x,0}, {y,1}, {z,0}, 3 ] TruncatedSeries[ ArcTan[x]/(y-1), {x,Infinity}, {y,0}, 3 ] The solution posted at http://forums.wolfram.com/mathgroup/archive/2003/Jul/msg00356.html would only work when the series expansion is about {x0,y0} with (x0==y0). That approach could be generalized for higher dimensions such as a series about {x0,y0,z0} provided (x0==y0==z0). My package doesn't have that restriction. However, my package will only do series in two or three variables. -------------------- Regards, Ted Ersek Download Mathematica tips, tricks from http://www.verbeia.com/mathematica/tips/Tricks.html
- Follow-Ups:
- Re: Re: Series
- From: Daniel Lichtblau <danl@wolfram.com>
- Re: Re: Series