scipy.fftpack.
sc_diff#
- scipy.fftpack.sc_diff(x, a, b, period=None, _cache=<_thread._local object>)[source]#
- Return (a,b)-sinh/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 = sqrt(-1)*sinh(j*a*2*pi/period)/cosh(j*b*2*pi/period) * x_j y_0 = 0 - Parameters:
- xarray_like
- Input array. 
- a,bfloat
- Defines the parameters of the sinh/cosh pseudo-differential operator. 
- periodfloat, optional
- The period of the sequence x. Default is 2*pi. 
 
 - Notes - sc_diff(cs_diff(x,a,b),b,a) == xFor even- len(x), the Nyquist mode of x is taken as zero.