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- #!/usr/bin/env python3
- import mpmath as mp
- import numpy as np
- Du_test = [
- # // x, [Re(m), Im(m)], Qext, Qsca, test_name
- [0.099, [0.75,0], 7.417859e-06, 7.417859e-06, 'a'],
- # [0.101, [0.75,0], 8.033538e-06, 8.033538e-06, 'b'],
- # [10, [0.75,0], 2.232265, 2.232265, 'c'],
- # [1000, [0.75,0], 1.997908, 1.997908, 'd'],
- # [100, [1.33,-1e-5], 2.101321, 2.096594, 'e'],
- # [10000, [1.33,-1e-5], 2.004089, 1.723857, 'f'],
- # [0.055, [1.5, -1], 0.101491, 1.131687e-05, 'g'],
- # [0.056, [1.5, -1], 0.1033467, 1.216311e-05, 'h'],
- # [100, [1.5, -1], 2.097502, 1.283697, 'i'],
- # [10000, [1.5, -1], 2.004368, 1.236574, 'j'],
- # [1, [10, -10], 2.532993, 2.049405, 'k'],
- # [100, [10, -10,], 2.071124, 1.836785, 'l'],
- [10000, [10, -10], 2.005914, 1.795393, 'm'],
- [80, [1.05, 1], 0, 0, 'du'],
- ]
- # // Dtest refractive index is m={1.05,1}, the size parameter is x = 80
- n_list = [0,1,30,50,60,70,75,80,85,90,99,116,130];
- def get_z_values(du_list):
- zlist = []
- for record in du_list:
- x = mp.mpf(str(record[0]))
- m = mp.mpc(str(record[1][0]), str(record[1][1]))
- z = x*m
- zlist.append(z)
- return zlist
- # Riccati-Bessel z*j_n(z)
- def psi(n,z):
- return mp.sqrt( (mp.pi * z)/2 ) * mp.besselj(n+1/2,z)
- # to compare r(n,z) with Wolfram Alpha
- # n=49, z=1.3-2.1i, SphericalBesselJ[n-1,z]/SphericalBesselJ[n,z]
- def r(n,z):
- return psi(n-1,z)/psi(n,z)
- def D1(n,z):
- return r(n,z) - n/z
- def main ():
- mp.mp.dps = 62
- output_dps = 10
- zlist = get_z_values(Du_test)
- for z in zlist:
- print(z)
- for n in n_list:
- print(n, mp.nstr(D1(n,z), output_dps))
- main()
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