id summary reporter owner description type status priority milestone component resolution keywords cc merged author reviewer upstream work_issues branch commit dependencies stopgaps
21614 Doctest fix for: Make atan2(0,0) return NaN rws "Same with `tan` and `imag`:
{{{
sage: real(sqrt(sin(x)))
sqrt(abs(sin(x)))*cos(1/2*arctan2(cos(real_part(x))*sinh(imag_part(x)), cosh(imag_part(x))*sin(real_part(x))))
sage: _.subs(x==0)
...
RuntimeError: arctan2_eval(): arctan2(0,0) encountered
}}}
!SymPy expands similarly but gives NaN on substitution instead of an exception.
This all would not be of concern if not 3d plotting would likely need real/imag parts of a function, their workaround `real(...,hold=True)` works perfectly but this is not the general solution that is needed.
One solution would be to return `NaN` instead of throwing up." defect closed minor sage-7.4 symbolics fixed Ralf Stephan Jeroen Demeyer N/A fda5183e4f4cbf498d23744924694756ec5e9a51 fda5183e4f4cbf498d23744924694756ec5e9a51 #21623