scipy.fftpack.cc_diff¶
- scipy.fftpack.cc_diff(x, a, b, period=None, _cache={})[source]¶
Return (a,b)-cosh/cosh pseudo-derivative of a periodic sequence.
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
- Parameters
- xarray_like
The array to take the pseudo-derivative from.
- a,bfloat
Defines the parameters of the sinh/sinh pseudo-differential operator.
- periodfloat, optional
The period of the sequence x. Default is
2*pi.
- Returns
- cc_diffndarray
Pseudo-derivative of periodic sequence x.
Notes
cc_diff(cc_diff(x,a,b),b,a) == x