help for fourier_info

Dear all,
I am doing some harmonic analysis using the built-in function of fourier_info. Also,I know the returned value includes the amplitude and phase of each harmonic.But I am wondering what do the amplitude and phase stand for?
for example:
f=fourier_info(x,3,1)
f(0,:,:,:) present the amplitude (amplitude^2= the (real)^2+(imag)^2)
f(1,:,:,:) present the phase angle
If I want to select wave-1,wave-2,wave-3 and re-build f using the fourier_coeficent ,how do I design the script ?

Thanks

lcx
2007-01-20

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Received on Fri Jan 19 2007 - 19:58:24 MST