def spherical_in(n, z, derivative=False):
 if derivative:
  return _spherical_in_d(n, z)
 else:
  return _spherical_in(n, z)

def spherical_in ( n , z , derivative = False ) : if derivative : return _spherical_in_d ( n , z ) else : return _spherical_in ( n , z )
modified spherical bessel function of the first kind or its derivative .