Re: fourier transform
- To: mathgroup at smc.vnet.net
- Subject: [mg61215] Re: fourier transform
- From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
- Date: Thu, 13 Oct 2005 01:39:26 -0400 (EDT)
- Organization: Uni Leipzig
- References: <dii9qs$9q1$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hi, a discrete Fourier transform uses always equidistant sampled data on the interval [0,2Pi) and you have to use an interpolation if the data are not equidstant and a scaling when you are not in the interval [0,2Pi). Since the interval is fixed, Fourier[] don't need the independent variables at all. Regards Jens "Masrur Hossain" <Lessjunk at yahoo.com> schrieb im Newsbeitrag news:dii9qs$9q1$1 at smc.vnet.net... | Hi folks | I have a list of pairs of numbers like | | {{1.2, 3.4}, {2.2, 3.6}............} | The first part is time and second part is amplitude. | | when I do the fourier transform by using | Fourier[list] | | it gives me list of complex numbers but I expect real numbers | (i.e . amplitude versus frequency) | | | Any help appreciated. | | thanks | -- | Masrur Hossain |