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question relating to FFT [message #65387]

Mon, 02 March 2009 10:26

Hu
Messages: 35
Registered: January 2009

Member

Hi, there
I try to use FFT function to smooth a curve (an array), and the code
is like this:

FUNCTION FOURIER,ARRAY ;*****FAST FOURIER FLITER
FILTER=1.0/(1.0+DIST(152)/4.0)^2
newARRAY=FFT(FFT(ARRAY,-1)*FILTER,1)
RETURN,newARRAY
END

when I got an array X (has 152 elements) and use this function like :

Y = FOURIER(X)

I got an result Y with 152 elements, but all the elements are complex
number, but How can I got an array filled with regular number, not
complex number?

I mean, I want to use the result to calculate regression relationship
with other array.

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[Message index]

		question relating to FFT By: Hu on Mon, 02 March 2009 10:26
		Re: question relating to FFT By: R.G. Stockwell on Wed, 04 March 2009 13:12

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