Re: Problems with Legendre expansion
- To: mathgroup at smc.vnet.net
- Subject: [mg24467] Re: [mg24402] Problems with Legendre expansion
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Wed, 19 Jul 2000 01:21:45 -0400 (EDT)
- Organization: University of Western Australia
- References: <8l0qg7$dvp@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Kevin.McCann at jhuapl.edu writes: >I am doing a Legendre expansion of Sin[Pi x] and have, amongst others, >the following integral > >Integrate[Sin[Pi*x]*LegendreP[21,x],{x,-1,1}] > >Mathematica just returns the input with the polynomial expanded out. You can often assist Integrate for "polynomial" by integrands by expanding the integrand: Integrate[Expand[Sin[Pi*x]*LegendreP[21,x]],{x,-1,1}] Cheers, Paul -- Paul Abbott Phone: +61-8-9380-2734 Department of Physics Fax: +61-8-9380-1014 The University of Western Australia Nedlands WA 6907 AUSTRALIA http://physics.uwa.edu.au/~paul