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Re: [vsnet-chat 6588] Fw: Re: Fourier > Most references will discuss Fast Fourier Transforms; which can be used if > your data signals are evenly sampled (in time or frequency steps). Of more > use to you would be Discrete Fourier Transforms; which can also analyse > "intermittent" data such as typical variable star observations. Oh, I forgot to mention this! Thanks! (Strictly speaking, Fast Fourier Transform (FFT) is one of Discrete Fourier Transforms, since it deals with evenly sampled discreate data. The most practical use of Fourier analysis in astronomy is period analysis of unevenly sampled data -- this is a big subject, and we can even write a book solely on this issue ;-). So one can mostly skip learning the details of the FFT when applying Fourier analysis to variable star works, although there is an elegant mathematical trick in it. Regards, Taichi Kato
Return to the Daisaku Nogami
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