comp.lang.idl-pvwave archive: archive

Home » Public Forums » archive » FFT help

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

FFT help [message #41624]

Thu, 04 November 2004 22:05

IDLmastertobe
Messages: 54
Registered: June 2004

Member

Hey, I am experiencing problem using fft function. Since FFT function
provides the fourier transform of a certain input, for example,
8*cos(!PI*x/6), I would expect an amplitude of 4 at 2 shifted frequencies,
namely -!PI/6 and PI/6. However after I recieved data from the FFT, I
recieved some amplitudes close to 2 at some random locations, can anyone
explain to me why it happened? Thanks for your time.

Report message to a moderator

[Message index]

		FFT help By: IDLmastertobe on Thu, 04 November 2004 22:05
		Re: FFT help By: IDLmastertobe on Wed, 10 November 2004 20:47

Previous Topic:	iTools programming
Next Topic:	f77 unformatted file reading error

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 09:07:24 PDT 2025

Total time taken to generate the page: 1.36465 seconds