Simple CBS extrapolation & utility script for creating focal point tables.
Append to your .bashrc, where PATH_TO_EXTRAP is something like /home/mmd01986/dev/, then,
export PYTHONPATH=$PYTHONPATH:PATH_TO_EXTRAP
Example using Feller exponential extrapolation (SCF 3 point extrapolation):
>>> import extrap
>>> xs = [2,3,4]
>>> es = [-1.0,-1.1,-1.11]
>>> ans = extrap.extrapolate(xs,es,extrap.exp,pts=3)
>>> ans[0][0]
-1.1111111111111112
>>>
Example using X^-3 (correlation 2 point extrapolation)
>>> xs = [3,4]
>>> es = [-1.1,-1.11]
>>> ans = extrap.extrapolate(xs,es,extrap.xm3)
>>> ans[0][0]
-1.1172972972972974