In article <93a9ea9a-00ab-4022-a567-8ba268790681@s12g2000prg.googlegroups.com>, Keflavich <keflavich@gmail.com> wrote: > >Hey, I have a bit of code that died on a domain error when doing an >arcsin, and apparently it's because floating point subtraction is >having problems. I know about the impossibility of storing floating >point numbers precisely, but I was under the impression that the >standard used for that last digit would prevent subtraction errors >from compounding. > >Is there a simple solution to this problem, or do I need to run some >sort of check at every subtraction to make sure that my float does not >deviate? I'm not sure I know even how to do that. Switch to Decimal module? Available in 2.4 and later. -- Aahz (aahz@pythoncraft.com) <*> http://www.pythoncraft.com/ "Typing is cheap. Thinking is expensive." --Roy Smith