贝塞尔函数的计算子程序

代码说明：

It is a FORTRAN90 library which evaluates Bessel J functions of noninteger order. List of Routines: BESSEL_JX_VALUES returns some values of the Jx Bessel function. DBESJ computes Bessel J functions of non integer order. D1MACH returns double precision real machine constants. D9LGMC computes the log Gamma correction factor. DASYJY computes Bessel J and Y functions of large order. DCSEVL evaluates a Chebyshev series. DJAIRY computes the Airy function Ai(x) and its derivative. DGAMLM computes bounds for the argument in the Gamma function. DGAMMA computes the complete Gamma function. DLNGAM computes the logarithm of the absolute value of the Gamma function. I1MACH returns integer machine constants. INITDS determines the necessary length of a Chebyshev series. RJBESL evaluates a sequence of Bessel J functions. TIMESTAMP prints the current YMDHMS date as a time stamp. XERMSG