Should have also mentioned:

Sage 4.3.3
OS X 10.6.2
64bit Intel
MacBook Pro


On Mar 17, 5:38 pm, G B <g.c.b.at.w...@gmail.com> wrote:
> While waiting to be approved, I think I narrowed this down to a very
> simple test case.
>
> atan2(3,0)   --> 1/2*pi
> atan2(-3,0)  --> -1/2*pi
> atan2(pi,0)  --> 1/2*pi
> atan2(-pi,0) -->  RuntimeError: power::eval(): division by zero
>
> Any ideas how to get around this?
>
> Thanks--
>  Greg
>
> Here's the full traceback:
>
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "_sage_input_34.py", line 9, in <module>
>     open("___code___.py","w").write("# -*- coding: utf-8 -*-\n" +
> _support_.preparse_worksheet_cell(base64.b64decode("YXRhbjIoLXBpLDAp"),glob 
> als())
> +"\n"); execfile(os.path.abspath("___code___.py"))
>   File "", line 1, in <module>
>
>   File "/private/var/folders/ol/olxcekVE2RWirE+1YxlblU+++TI/-Tmp-/
> tmphh0DH2/___code___.py", line 3, in <module>
>     atan2(-pi,_sage_const_0 )
>   File "", line 1, in <module>
>
>   File "function.pyx", line 709, in
> sage.symbolic.function.GinacFunction.__call__ (sage/symbolic/
> function.cpp:6394)
>   File "function.pyx", line 430, in
> sage.symbolic.function.Function.__call__ (sage/symbolic/function.cpp:
> 4448)
> RuntimeError: power::eval(): division by zero

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