scipy.fftpack.ss_diff#
- scipy.fftpack.ss_diff(x, a, b, period=None, _cache={})[source]#
Return (a,b)-sinh/sinh 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 = sinh(j*a*2*pi/period)/sinh(j*b*2*pi/period) * x_j y_0 = a/b * x_0
- Parameters:
- xarray_like
The array to take the pseudo-derivative from.
- a,b
Defines the parameters of the sinh/sinh pseudo-differential operator.
- periodfloat, optional
The period of the sequence x. Default is
2*pi.
Notes
ss_diff(ss_diff(x,a,b),b,a) == x