Thanks for all the helpful suggestions. I did not realize that is_Integer() was deprecated.
On Apr 22, 2:00 am, John Cremona <john.crem...@gmail.com> wrote: > This is precisely why we deprecated all the is_*() functions for end-user use: > > ---------------------------------------------------------------------- > | Sage Version 3.4.1.rc4, Release Date: 2009-04-19 | > | Type notebook() for the GUI, and license() for information. | > ---------------------------------------------------------------------- > > sage: is_Integer(3/2+1/2) > /home/masgaj/.sage/temp/host_56_150/29373/_home_masgaj__sage_init_sage_0.py:1: > DeprecationWarning: > Using is_Integer from the top level is deprecated since it was > designed to be used by developers rather than end users. > It most likely does not do what you would expect it to do. If you > really need to use it, import it from the module that it is defined > in. > # -*- coding: utf-8 -*- > False > > sage: (3/2+1/2).is_integral() > True > > The is_*() functions just test the type of an abject (in programming terms): > > sage: type(3/2+1/2) > <type 'sage.rings.rational.Rational'> > > and the result of 3/2+1/2 is of type Rational. Mathematically, of > course, the same number can be an integer and a rational (and a real > and a complex and ...). > > John > > 2009/4/22 Robert Bradshaw <rober...@math.washington.edu>: > > > > > On Apr 21, 2009, at 10:54 PM, Craig Citro wrote: > > >>> In module sage.rings.integer > > >>> is_Integer(3/2+1/2) > > >>> returns > > >>> False The expected output should be True as 3/2+1/2 = 2. > > >>> I was planning to use this function to check if the result of > >>> division > >>> is a whole number. > > >> You could also use the is_integral method of rational numbers: > > >> sage: n = 3/2 + 1/2 > >> sage: n.is_integral() > >> True > > >> (This function also exists on Integers, so you could even use it in > >> situations where you weren't sure if you had an honest Integer or an > >> integer masquerading as a Rational.) > > > Another option is > > > sage: 3/2 + 1/2 in ZZ > > True > > sage: 3/2 + 1/3 in ZZ > > False > > > - Robert --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
