New submission from Mark Dickinson <dicki...@gmail.com>: The documentation for the cmath module is misleading on the behaviour near branch cuts. For example, the documentation for cmath.acos says:
Return the arc cosine of x. There are two branch cuts: One extends right from 1 along the real axis to ∞, continuous from below. The other extends left from -1 along the real axis to -∞, continuous from above. That "continuous from below" and "continuous from above" language is misleading; in fact what happens on the vast majority of systems (those for which the floating-point format used is IEEE 754 binary64), if the imaginary part of x is zero, the sign of x is used to determine which side of the branch cut x lies. ---------- messages: 373323 nosy: mark.dickinson priority: normal severity: normal status: open title: cmath module documentation is misleading on branch cuts _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue41245> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
