On Thu, Sep 25, 2008 at 6:06 PM, Robert Bradshaw <[EMAIL PROTECTED]> wrote: > > > On Sep 25, 2008, at 5:43 PM, William Stein wrote: > >> >> On Thu, Sep 25, 2008 at 5:33 PM, Quicksilver_Johny >> <[EMAIL PROTECTED]> wrote: >>> >>> If c=sqrt(a^2+b^2) >>> How would I check if c is an integer in order to get a true/false >>> value. >>> I tried is_Integer(ZZ(c)), this returns true when c is an integer, >>> but >>> ZZ(c) returns an error when c is not an integer. >> >> Try using Python's try/except: >> >> try: >> ZZ(c) >> # c is an integer >> except TypeError: >> # c isn't an integer > > These is_* sure are causing a lot of confusion lately...
Indeed! I like Mike Hansen's (or your) proposal to get rid of them all from the global namespace, and replace them only by "is_lowercase_method_name" functions that are all conceptually meaningful. Of course leave the type-checking is_Uppercase's around, but don't put them in all.py's. What do you guys think? > > Rational numbers also have an is_integral method, so you could also dos > > c=sqrt(a^2+b^2) If a,b are integers, then c is either an integer or an element of the symbolic ring... > if c.is_integral(): > # c is an integer > > - Robert > > > > -- William Stein Associate Professor of Mathematics University of Washington http://wstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
