Re: Series
- To: mathgroup at smc.vnet.net
- Subject: [mg42865] Re: Series
- From: "Ersek, Ted R" <ErsekTR at navair.navy.mil>
- Date: Thu, 31 Jul 2003 01:47:52 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Earlier I mentioned a TruncatedSeries package I recently posted at http://library.wolfram.com/infocenter/MathSource/4950/ Daniel Lichtblau promptly explained that it didn't give the intended result, and showed how the method from Deprit and Abbott could be modified to allow for a series expansion about a general base point. I have since corrected my package to use the code recently provided by Daniel Lichtblau. In addition I think I fixed thae package so that it will correctly truncate a series in the following cases: TruncateSeries[f, {{x,Infinity}, {y,y0}}, n] TruncateSeries[f, {{x,x0}, {y,Infinity}}, n] The method from Lichtblau, Deprit, and Abbott has the advantage that it can handle an expansion in any number of variables. However, that method can't handle a series expansion about Infitiy. My new improved version is now posted at http://library.wolfram.com/infocenter/MathSource/4950/ ------------- Regards, Ted Ersek