Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

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
>
>
>
>  
>


  • Prev by Date: Re: launching a kernel on a remote linux machine through ssh from a linux machine
  • Next by Date: Re: FourierTransform
  • Previous by thread: Re: FourierTransform
  • Next by thread: Re: FourierTransform