Updates:
Cc: ondrej.certik
Labels: NeedsReview
Comment #1 on issue 1634 by smichr: Cannot compare NumberSymbols like pi
and E
http://code.google.com/p/sympy/issues/detail?id=1634
pi<0 is recognized as a number comparison and goes to lt of numbers.py
-pi is an expression and calls up the basic.py lt routine.
The attached patch makes the basic relational operators return a True or
False if the
sign of the quantities involved can be determined. Tests are included.
###
>>> from sympy import *
>>> pi<3
False
>>> -pi<0
True
>>> var('x')
x
>>> x<0
x < 0
>>> x-2<x-3
False
###
All tests pass; all modified code covered.
/c
Attachments:
0001-basic-relationals-changes-so-pi-0-is-True.patch 2.2 KB
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