Hi,
I found an integral that sometimes fails, sometime succeeds depending on
the variable name. See the session below.
How can I avoid such unexpected behavior?
This is with SymPy 0.7.1 on windows.
Thanks in advance.
IPython console for SymPy 0.7.1 (Python 2.7.2-32-bit) (ground types: python)
These commands were executed:
>>> from __future__ import division
>>> from sympy import *
>>> x, y, z, t = symbols('x y z t')
>>> k, m, n = symbols('k m n', integer=True)
>>> f, g, h = symbols('f g h', cls=Function)
Documentation can be found at http://www.sympy.org
In [1]: x,a=symbols('x a')
In [2]: integrate(exp(-(a**2+a)/2),(a,-oo,oo))
Out[2]:
oo
/
|
| 2
| a a
| - -- - -
| 2 2
| e da
|
/
-oo
In [3]: integrate(exp(-(x**2+x)/2),(x,-oo,oo))
Out[3]:
___ ____ 1/8
\/ 2 *\/ pi *e
In [4]:
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