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Home MathPack Fourier Properties ImagSpec | |||||||||||||
See also: RealSpec, FourSerSinCoeff, PowerSpec, ImagMax, ImagMin, FData | |||||||||||||
ImagSpec |
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The array property ImagSpec provides access to the imaginary part of the spectrum. The index ix may assume values between 1 and SpectrumSize. Accessing any value of the array below 1 and above SpectrumSize will result in a zero value on read, or in no action on write. Note: Since the index of the data buffer starts with 1 (and not 0), the index of the harmonics of the resulting Fourier spectrum is shifted by one. Thus the constant coefficient a0 is stored in ImagSpec[1], the first harmonic in ImagSpec[2], the second in ImagSpec[3], and so on.
The figure below shows the order of the frequency components as they are stored in ImagSpec after performing a Fourier transform:
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