Re: Fourier? (Q)
- To: mathgroup at smc.vnet.net
- Subject: [mg3648] Re: [mg3602] Fourier? (Q)
- From: hagai at helix.nih.gov (Hagai Agmon-Snir)
- Date: Sun, 31 Mar 1996 00:52:27 -0500
- Sender: owner-wri-mathgroup at wolfram.com
>greetings: > >when i tried to go through the Fourier examples as per pgs 679-681 in the >Mma bible; > >Mma kindly returned the following: >In[65]:= >?Fourier >Fourier[list] finds the discrete Fourier transform of a list > of complex numbers. >In[66]:= >data={1,1,1,1,-1,-1,-1,-1} >Out[66]= >{1, 1, 1, 1, -1, -1, -1, -1} >In[67]:= >Fourier[data] >Out[67]= >Fourier[{1, 1, 1, 1, -1, -1, -1, -1}] You have a point. Here what solves it: In[29]:= data={1.,1.,1.,1.,-1.,-1.,-1.,-1.} Out[29]= {1., 1., 1., 1., -1., -1., -1., -1.} In[30]:= Fourier[data] Out[30]= {0. + 0.*I, 0.7071067811865479 + 1.707106781186547*I, 0. + 0.*I, 0.7071067811865474 + 0.2928932188134521*I, 0. + 0.*I, 0.7071067811865475 - 0.2928932188134524*I, 0. + 0.*I, 0.7071067811865474 - 1.707106781186547*I} What few dots can do (especially if they are not documented}! I never realized before that Fourier would not accept integers. Hagai >>>>>>>>>>>>>>>>>> ================================ <<<<<<<<<<<<<<<<< Hagai Agmon-Snir Tel: (301) 496-9972 (301) 496-4325 Surface mail: Fax: (301) 402-0535 Mathematical Research Branch, NIDDK 9190 Rockville Pike - Suite 350 Bethesda, MD 20814-3800 USA E-mail: hagai at helix.nih.gov WWW: http://mrb.niddk.nih.gov/hagai <<<<<<<<<<<<<<<<< ================================ >>>>>>>>>>>>>>>>>> ==== [MESSAGE SEPARATOR] ====