scipy.fftpack.cc_diff

scipy.fftpack.cc_diff(x, a, b, period=None, _cache={})

cc_diff(x, a, b, period=2*pi) -> y

Return (a,b)-cosh/cosh pseudo-derivative of a periodic sequence x.

If x_j and y_j are Fourier coefficients of periodic functions x and y, respectively, then

y_j = cosh(j*a*2*pi/period)/cosh(j*b*2*pi/period) * x_j

Input:

a,b

Defines the parameters of the sinh/sinh pseudo-differential operator.

Optional input:

period

The period of the sequence x. Default is 2*pi.

Notes:

cc_diff(cc_diff(x,a,b),b,a) == x