Sat Mar 9 17:18:06 EST 2013

Exponentials: Reset + Nth root

Problem with previous reset algo is that ^exp(P1) and ^exp((P1-P0)/n)
can have strong difference in precision.

Alternative method:

Compute exp(P1) using a "human precise" approximation, i.e. something
that is good enough as real end point, then interpolate from exp(P0)
through the Nth root of ^exp(P1) / ^exp(P0).  This takes care of
accumulating errors, but requires more work.

However, this might be solved by using a Newton-Raphson step from an
initial value of ^exp((P1-P0)/N).