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Bug 11654 – std.complex.arg should return a value in the range 0 <= theta < 2*PI

Status: RESOLVED
Resolution: INVALID
Severity: normal
Priority: P2
Component: phobos
Product: D
Version: D2
Platform: All
OS: All
Creation time: 2013-11-30T09:12:00Z
Last change time: 2013-11-30T09:20:59Z
Assigned to: nobody
Creator: joseph.wakeling

Comments

Comment #0 by joseph.wakeling — 2013-11-30T09:12:38Z

It ought to simplify handling (and testing) complex numbers if we constrain the argument (i.e. angle theta in polar coordinate form) of complex numbers to fall within the range [0, 2 * PI). Example case: should arg(complex(-1.0, 0)) be PI or -PI?

Comment #1 by joseph.wakeling — 2013-11-30T09:20:59Z

Sorry; this is nonsense, it ought to return a value in the range (-PI, PI]. The problem is that arg() is returning a value of -PI.