AndrewWave.
rho
The robust criterion function for Andrew’s wave.
z : array_like
1d array
rho : ndarray
rho(z) = a*(1-cos(z/a)) for |z| <= a*pi rho(z) = 2*a for |z| > a*pi
rho(z) = a*(1-cos(z/a)) for |z| <= a*pi
rho(z) = 2*a for |z| > a*pi