Updates:
Status: Invalid
Comment #2 on issue 3782 by [email protected]: Error in dividing a symbol
by a fraction
http://code.google.com/p/sympy/issues/detail?id=3782
This is due to integer division. SymPy is just built on top of Python, so
we have no control of int_literal/int_literal. See
http://docs.sympy.org/dev/gotchas.html#python-numbers-vs-sympy-numbers.
There are a few things you can do to get around this:
- Use "from __future__ import division". This will at least give you floats
always, which should alert you to when this happens, and you won't get
strange things like 1/2 == 0.
- Use isympy. This will do the __future__ import division. If you are just
working interactively, you can use isympy -i, which will automatically wrap
all integer literals with Integer, meaning that you can just type "1/2"
instead of Rational(1, 2).
- In code, use S(1)/2, or when you can, avoid int_literal/int_literal by
putting something else in between, like 3*x/4 instead of 3/4*x.
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