Re: Limit glitch
- To: mathgroup at smc.vnet.net
- Subject: [mg14090] Re: Limit glitch
- From: "Stephen P Luttrell" <luttrell at signal.dra.hmg.gb>
- Date: Fri, 25 Sep 1998 03:15:18 -0400
- Organization: Defence Evaluation and Research Agency
- References: <6u7jdb$snu@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
>I'm wondering whether this has been covered here before. I just noticed >that Limit often gives wrong results at jump discontinuities. For >example, Limit[x/Abs[x], x->0] returns 1. The pattern seems to be >that the right-sided limit is always given. > >Does anyone know anything about this? Try this input Limit[x/Abs[x], x->0,Direction->1] which explicitly says that the limit is to be approached from below. It correctly gives the limit as -1. ==================================================== Stephen P Luttrell Signal Processing and Imagery Department DERA Malvern, St.Andrew's Road Malvern, United Kingdom, WR14 3PS +44 (0)1684 894046 (tel) +44 (0)1684 894384 (fax) luttrell at signal.dera.gov.uk (email) http://www.dera.gov.uk/cis5pip/Welcome.html (web)