scipy.fftpack.
ss_diff#
- scipy.fftpack.ss_diff(x, a, b, period=None, _cache=<_thread._local object>)[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