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FFT help [message #41624] Thu, 04 November 2004 22:05 Go to next message
IDLmastertobe is currently offline  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.

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Re: FFT help [message #41663 is a reply to message #41624] Wed, 10 November 2004 20:47 Go to previous message
IDLmastertobe is currently offline  IDLmastertobe
Messages: 54
Registered: June 2004
Member
Thanks a lot guys. It was really helpful and I appreciate your time.

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