Re: collect derivatives
- To: mathgroup at smc.vnet.net
- Subject: [mg23350] Re: collect derivatives
- From: Eckhard Hennig <hennig at itwm.uni-kl.de>
- Date: Thu, 4 May 2000 02:59:17 -0400 (EDT)
- Organization: ITWM
- References: <8eg6bb$h2f@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Robert schrieb in Nachricht <8eg6bb$h2f at smc.vnet.net>... >is there a way to use "collect[]" to collect all terms with a specific >derivative, e.g. to produce something like > >z''[x] u[x] + z'[x] (u'[x]+u[x]) + z[x] > Yes, you can use Collect as follows: Collect[yourexpr, z[x] | Derivative[_][z][x]] -- Eckhard ----------------------------------------------------------- Dr.-Ing. Eckhard Hennig mailto:hennig at itwm.uni-kl.de Institut fuer Techno- und Wirtschaftsmathematik e.V. (ITWM) Erwin-Schroedinger-Strasse, 67663 Kaiserslautern, Germany Voice: +49-(0)631-205-3126 Fax: +49-(0)631-205-4139 http://www.itwm.uni-kl.de/as/employees/hennig.html ITWM - Makers of Analog Insydes for Mathematica http://www.itwm.uni-kl.de/as/products/ai -----------------------------------------------------------