Posted by David Galant on June 25, 1998 at 02:37:14:
In Reply to: rkf45 and machine speed posted by Jason on June 24, 1998 at 18:51:08:
: I am trying to use the rkf45.f subroutine to solve a set
: of ODE's. However, the compiler I am using (microsoft
: fortran for pc) can't compile the code due to the use of
: a variable: d1mach.
: As far as I am aware, this is some term which relates
: the machine speed to the minimum error tolerance (in
: the comment, termed 'machine epsilon')
: Is this term platform/compiler specific?
: Can I safely comment this check out?
: Anyone have any comments / advice?
: Thanks in advance
d1mach is a subroutine which can be found at netlib.
It gives information about the characteristics of
the floating point arithmetic on the machine being
used. It contains information on many arithmetics and
the proper information for your machine has to be