Re: FourierTransform
- To: mathgroup at smc.vnet.net
- Subject: [mg52528] Re: [mg52517] FourierTransform
- From: yehuda ben-shimol <benshimo at bgu.ac.il>
- Date: Wed, 1 Dec 2004 05:57:44 -0500 (EST)
- References: <200411301024.FAA01399@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
You do not have to give up your classroom demos. Adding some properties to a built-in function is easy. Try Unprotect[FourierTransform]; FourierTransform[f_'[x_], x_, k_] := -\[ImaginaryI] k FourierTransform[f[x], x, k]; Protect[FourierTransform] yehuda Dr A.H. Harker wrote: >In Version 4 Mathematica was smart enough to know that > >FourierTransform[f'[x], x, k] > >should give > >-\[ImaginaryI] k FourierTransform[f[x], x, k]. > > Version 5 seems no longer to do this -- a nice classroom demonstration and >a valuable method of solving differential equations down in flames. > > Why is this? > > > Tony Harker (Dr A.H. Harker) > Deputy Head of Department > Deputy Head, Condensed Matter and Materials Physics Group > Department of Physics and Astronomy > University College London > Gower Street > LONDON > WC1E 6BT > (44)(0)207 679 3404 > a.harker at ucl.ac.uk > > > > >