Re: Define a function and its derivatives
- To: mathgroup at smc.vnet.net
- Subject: [mg43376] Re: Define a function and its derivatives
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Wed, 27 Aug 2003 04:05:02 -0400 (EDT)
- Organization: The University of Western Australia
- References: <bi7mvh$p1h$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
In article <bi7mvh$p1h$1 at smc.vnet.net>, "Martin Manscher" <reversed-email-rehcsnam at kd.utd.tac> wrote: > I wish to define a function and its derivatives. The function expression is > complicated, but the derivatives are fairly simple (full cut-and-paste > notebook expression below). But these derivatives are _not_ correct over the same domain as the function (you have z Real which includes z == 0)! The DiracDelta's arise (correctly here) because you are taking derivatives of a step function. Cheers, Paul -- Paul Abbott Phone: +61 8 9380 2734 School of Physics, M013 Fax: +61 8 9380 1014 The University of Western Australia (CRICOS Provider No 00126G) 35 Stirling Highway Crawley WA 6009 mailto:paul at physics.uwa.edu.au AUSTRALIA http://physics.uwa.edu.au/~paul