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README
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1990-05-03
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Extended Precision Arithmetic
This is a package that allows a FORTRAN program to have
access to arbitrary precision floating point numbers.
Program CALPI is an example of how these routines can be
used to calculate pi to many decimal places. This program uses an
iterative method described in the February 1988 issue of
Scientific American. The sequence to find pi converges extremely
rapidly. The computation times are on a generic PC using Microsoft
FORTRAN 3.3.
Iteration Number of Correct Digits Computation Time
1 8
2 41 8 sec
3 171 1.5 min
4 694 25 min
5 2792 8.75 hours
The idea in writing these routines was to make them
portable. They should work on almost any computer with a FORTRAN
77 compiler.
Mark P. Esplin
Stewart Radiance Lab
139 The Great Rd.
Bedford Mass, 01730