libgo/go/cmath/phase.go

   1 // Copyright 2010 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package cmath
   6
   7 import "math"
   8
   9 // Phase returns the phase (also called the argument) of x.
  10 // The returned value is in the range [-Pi, Pi].
  11 func Phase(x complex128) float64 { return math.Atan2(imag(x), real(x)) }