acsch(float) returns complex

[rwst]

sage: arccsch(float(0.1))
(2.99822295029797+0j)

should be

2.99822295029797

8-year old bug, triggered by recent Pynac changes

Component: symbolics

Author: Ralf Stephan

Branch: 4df530d

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/20818

[rwst]

Branch: u/rws/acsch_float__returns_complex

[rwst]

New commits:

4df530d

20818: back conversion in py_asinh incomplete

[rwst]

Commit: 4df530d

[rwst]

Author: Ralf Stephan

[fchapoton]

Reviewer: Frédéric Chapoton

[fchapoton]

comment:3

ok, looks good to me

[paulmasson]

comment:4

Ralf, I'm curious as to how you recognized the bug. Is there a previous Trac ticket?

[vbraun]

Changed branch from u/rws/acsch_float__returns_complex to 4df530d

[rwst]

comment:6

Replying to @paulmasson:

Ralf, I'm curious as to how you recognized the bug. Is there a previous Trac ticket?

After Volker gave me a function argument that showed the problem I traced what Pynac was doing. It called the fixed function and then it was obvious. How I know that this is 8 year old? You can use git blame to see when a specific line was changed.

[rwst]

Changed commit from 4df530d to none