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hi.... for DIT fft algorithm, refer to this link, it has c-code for that. http://cnx.org/content/m12016/latest/
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FT is needed for spectrum analysis, FFT is fast FT meaning it is used to obtain spectrum of a signal quickly, the FFT algorithm inherently is fast algorithm than the conventional FT algorithm
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A twiddle factor, in fast Fourier transform (FFT) algorithms, is any of the trigonometric constant coefficients that are multiplied by the data in the course of the algorithm.
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because they have a high speed compared to fft
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FFT reduces the computation since no. of complex multiplications required in FFT are N/2(log2N). FFT is used to compute discrete Fourier transform.
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plot(abs(fft(vectorname)))
the FFT function returns a complex vector thus when you plot it, you get a complex graph. If you plot the absolute value of the FFT array, you will get the magnitude of the FFT.
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FFT is faster than DFT because no. of complex multiplication in DFT is N^2 while in FFT no. of complex multiplications are N/2(log2N). for example if N=8 no. of complex multiplications required in DFT are 64. while no. of complex multiplications required in FFT are 12 thus reduces computation time.
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John Tukey was born on June 16, 1915 and died on July 26, 2000. John Tukey would have been 85 years old at the time of death or 100 years old today.
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When the means in all the groups are not equal, Tukey-Kramer procedure can help to determine which of the means are significantly different.
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John W. Tukey has written:
'Lecture notes on analysis of variance' -- subject(s): Mathematical statistics
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Stanley Cooley's birth name is Stanley Francis Cooley.
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Willard Cooley's birth name is Willard Ambrose Cooley.
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