digama.m calculates双（x）＝d（日志（γ（X）/ DX））

代码说明：

digama.m calculates DIGAMMA ( X ) = d ( LOG ( GAMMA ( X ) ) ) / dX psi_values.m returns some values of the Psi or Digamma function for testing. timestamp.m prints out the current YMDHMS date as a timestamp. asa103_test.m, a sample calling program. asa103_test01.m, tests DIGAMA. asa103_test_output.txt, the output file. -digama.m calculates DIGAMMA ( X ) = d ( LOG ( GAMMA ( X ) ) )/dX psi_values.m returns some values of the Psi or Digamma function for testing. timestamp.m prints out the current YMDHMS date as a timestamp. asa103_test.m, a sample calling program. asa103_test01.m, tests DIGAMA. asa103_test_output.txt, the output file.