Can you open an issue in the issue tracker for this? Aaron Meurer
On Tue, Nov 1, 2016 at 3:32 PM, Rüdiger Braun <[email protected]> wrote: > Hi all! > > The following code > > (compana16) braun:~/git/compana16$ ipython > Python 3.5.2 |Continuum Analytics, Inc.| (default, Jul 2 2016, 17:49:02) > Type "copyright", "credits" or "license" for more information. > > IPython 5.1.0 -- An enhanced Interactive Python. > ? -> Introduction and overview of IPython's features. > %quickref -> Quick reference. > help -> Python's own help system. > object? -> Details about 'object', use 'object??' for extra details. > > In [1]: import sympy > > In [2]: sympy.__version__ > Out[2]: '1.0' > > In [3]: x = sympy.Symbol('x') > > In [4]: a = sympy.Symbol('a', positive=True) > > In [5]: f = sympy.exp(x*(-a-1)) * sympy.sinh(x) > > In [6]: f.limit(x, sympy.oo) > Out[6]: oo > > > > produces false output. Correct is 0 > I think it is somehow related to caching. If caching is turned off, then > the product in [5] cannot even be constructed. > > (compana16) braun:~/git/compana16$ export SYMPY_USE_CACHE='no' > (compana16) braun:~/git/compana16$ ipython > Python 3.5.2 |Continuum Analytics, Inc.| (default, Jul 2 2016, 17:49:02) > Type "copyright", "credits" or "license" for more information. > > IPython 5.1.0 -- An enhanced Interactive Python. > ? -> Introduction and overview of IPython's features. > %quickref -> Quick reference. > help -> Python's own help system. > object? -> Details about 'object', use 'object??' for extra details. > > In [1]: import sympy > > In [2]: sympy.__version__ > Out[2]: '1.0' > > In [3]: x = sympy.Symbol('x') > > In [4]: a = sympy.Symbol('a', positive=True) > > In [5]: f = sympy.exp(x*(-a-1)) > > In [6]: g = sympy.sinh(x) > > In [7]: h = f*g > --------------------------------------------------------------------------- > KeyError Traceback (most recent call last) > /home/braun/miniconda3/envs/compana16/lib/python3.5/site-packages/sympy/core/assumptions.py > in getit(self) > 240 try: > --> 241 return self._assumptions[fact] > 242 except KeyError: > > KeyError: 'zero' > > During handling of the above exception, another exception occurred: > > KeyError Traceback (most recent call last) > /home/braun/miniconda3/envs/compana16/lib/python3.5/site-packages/sympy/core/assumptions.py > in getit(self) > 240 try: > --> 241 return self._assumptions[fact] > 242 except KeyError: > > KeyError: 'zero' > > > > This goes on until a RecursionError kicks in. > > Best regards > > Rüdiger Braun > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/sympy. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sympy/a1ca0361-3668-4ea0-b199-0ce08ab2a76b%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/CAKgW%3D6K2vj2HbhScGtoUSGiB6bYiA%3DYm5LnfG2sLaADrJ0Zr-g%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
