Module I0 in SPECFUN

• SPECFUN Information

• Components
  • Fullsource from NETLIB
  • Source from NETLIB
  • Test from NETLIB

I0

 
Computes modified Bessel functions of the first kind and order zero, I0(X) and
EXP(-ABS(X))*I0(X), for real arguments X. Uses rational functions that
theoretically approximate I0(X) to at least 18 significant decimal digits.
 
Classes  :  C10b1 . Bessel functions I and K of real argument and integer order
 
Type     : Fortran subroutine in SPECFUN package.
Access   : Public domain. Portable.
Precision: Single or double.
Note     : Both single and double precision versions can be extracted from the
           supplied source with simple editing changes.
 
Usage    : S = BESI0(X); S = BESEI0(X)
 
Details  : Fullsource Source Test
Sites    : (1) NETLIB
 

Implementation of I0 from SPECFUN on NETLIB

 
NETLIB:    Public access repository, The University of Tennessee at
           Knoxville and Bell Laboratories
 
Precision: Single or double.
Note     : Both single and double precision versions can be extracted from the
           supplied source with simple editing changes.
 
You may access components from NETLIB outside GAMS as follows.
 
   Source       : echo "send only i0 from specfun" | mail netlib@ornl.gov
   Fullsource   : echo "send i0 from specfun" | mail netlib@ornl.gov
   Test         : echo "send i0test from specfun" | mail netlib@ornl.gov