def j2(self,x):
"""
spherical bessel l=2
"""
return M.choose(M.greater(x,0.001),(x**2/15.0,((M.cos(x) * -3. / x -
M.sin(x) * (1. - 3. /x**2))/x)))
return
def j1(self,x):
"""
spherical bessel l=1
"""
return M.choose(M.greater(x,0.001),(x/3.0,(M.sin(x)/x - M.cos(x))/x))
def j0(self,x):
"""
spherical bessel l=0
"""
return M.choose(M.greater(x,0.001),(1.0-x**2/6.0,M.sin(x)/x))