Opened 4 years ago
Last modified 4 years ago
#21614 closed defect
Make atan2(0,0) return NaN — at Version 1
Reported by: | rws | Owned by: | |
---|---|---|---|
Priority: | minor | Milestone: | sage-7.4 |
Component: | symbolics | Keywords: | |
Cc: | Merged in: | ||
Authors: | Reviewers: | ||
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | pynac-0.6.91 | Stopgaps: |
Description (last modified by )
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.
Change History (1)
comment:1 Changed 4 years ago by
- Dependencies set to pynac-0.6.91
- Description modified (diff)
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