phase.mx raw

   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 cmplx
   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)) }
  12