Re: Re: Re: Finding the Fourier transform of discrete functions

*To*: mathgroup at smc.vnet.net*Subject*: [mg52616] Re: [mg52582] Re: Re: Finding the Fourier transform of discrete functions*From*: DrBob <drbob at bigfoot.com>*Date*: Sat, 4 Dec 2004 04:07:55 -0500 (EST)*References*: <cohi1d$1fh$1@smc.vnet.net> <200412011057.FAA19902@smc.vnet.net> <comgk7$7a2$1@smc.vnet.net> <200412030853.DAA26040@smc.vnet.net>*Reply-to*: drbob at bigfoot.com*Sender*: owner-wri-mathgroup at wolfram.com

No, I think x_Integer is discrete. Obviously. Bobby On Fri, 3 Dec 2004 03:53:37 -0500 (EST), Jens-Peer Kuska <kuska at informatik.uni-leipzig.de> wrote: > Hi, > > and you think that 1<=x<12 is discret, and not a infinite number > of continuous values ?? Strange ! > > Regards > Jens > > "DrBob" <drbob at bigfoot.com> schrieb im Newsbeitrag > news:comgk7$7a2$1 at smc.vnet.net... >>>> what is a "discrete function". >>>> if it is a function, the parameter is continuous and FourierTransform[] >>>> compute the transformation. >> >> A discrete function is a function with a discrete domain. >> >> For instance, this is a discrete function on the obvious domain: >> >> f[x_Integer]/;1<=x<=12 = Sin@x >> >> It is NOT the Sin function, for the simple reason that the domain of a >> function (in math or mathematica) is part of its definition. >> >> Bobby >> >> On Wed, 1 Dec 2004 05:57:38 -0500 (EST), Jens-Peer Kuska >> <kuska at informatik.uni-leipzig.de> wrote: >> >>> Hi, >>> >>> what is a "discrete function". If it is discrete you have a array of >>> discrete data and Fourier[] compute the DFT of the array, if it is >>> a function, the parameter is continuous and FourierTransform[] >>> compute the transformation. >>> >>> Regards >>> Jens >>> >>> >>> "Luca" <luca at nospam.it> schrieb im Newsbeitrag >>> news:cohi1d$1fh$1 at smc.vnet.net... >>>> I found out it's possible to determine the Fourier transform of a >>>> function. I tried to look for the discrete fourier transform in the >>>> guide, but I can find the item in the list without any explaination of >>>> the function. Is it possible to find the Fourier transform of a >>>> discrete function? >>>> Thanks to everyone. >>>> >>>> Luca >>>> >>> >>> >>> >>> >>> >> >> >> >> -- >> DrBob at bigfoot.com >> www.eclecticdreams.net >> > > > > > -- DrBob at bigfoot.com www.eclecticdreams.net

**References**:**Re: Finding the Fourier transform of discrete functions***From:*"Jens-Peer Kuska" <kuska@informatik.uni-leipzig.de>

**Re: Re: Finding the Fourier transform of discrete functions***From:*"Jens-Peer Kuska" <kuska@informatik.uni-leipzig.de>