On Wed, Jul 8, 2009 at 9:09 PM, smichr<smi...@gmail.com> wrote: > > > > On Jul 8, 10:23 pm, Ondrej Certik <ond...@certik.cz> wrote: > >> Ah, yes, I think it should be called fastlog2. Fredrik, what do you think? >> > And someone who has used this should probably comment on the need to > have the sign ignored: the fastlog for both 16 and -16 would be 4 as > it is written now. *Should* the sign be ignored or should a value > error be raised or should the docstring say that the fastlog of the > absolute value of x is being computed?
It's intended to compute an upper bound for the base-2 logarithm of the absolute value of a number. This is used to determine how much precision is required for various calculations. Whether it's exact too high by 1 or 2 bits doesn't really matter. It's also strictly intended as an internal function, so it probably doesn't need much more elaborate documentation or a more precise name (unless its present role is unclear to someone trying to understand the internals of the evalf module). Fredrik --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy?hl=en -~----------~----~----~----~------~----~------~--~---
