Re: Why the FourierTransform gives two different answers?

*To*: mathgroup at smc.vnet.net*Subject*: [mg125115] Re: Why the FourierTransform gives two different answers?*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Wed, 22 Feb 2012 05:31:10 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

On 2/21/12 at 6:17 AM, avderov at gmail.com wrote: >Why the FourierTransform gives two different answers? >In[1] FourierTransform[ (t - 5.0)^2*Exp[-(t - 5.0)^2 ], t, w] >In[2] FourierTransform[ (t - 5)^2* Exp[-(t - 5)^2 ], t, w] For input 1 you are using machine precision arithmetic and are subject to the limitations of your hardware. This is the nature of using machine precision arithmetic. For input 2 you are using exact arithmetic.