Fourier coefficients
If the COS&SIN
keyword is used,
then the FFT
function returns the
actual Fourier coefficients.
Let the cosine coefficients be called 's and let the
sine coefficients be called
's.
is
the mean value of the input data. As shown in the example below, these coefficients can be
used for smoothing and interpolation. Suppose
is the
interpolation location, and
2N
is the number of original data points.
If the COS&SIN
keyword is used, then the
FFT
function returns the actual Fourier
coefficients. Let the cosine coefficients be called
's and the sine coefficients be called
's.
is
the mean value of the input data. As shown in the example below, these
coefficients can be used for smooth interpolation. Suppose
is the interpolation location, and
2N
is the number of original data
points.