// Use of this source code is governed by a BSD-style

package cmplx

import

// The original C code, the long comment, and the constants
// below are from http://netlib.sandia.gov/cephes/c9x-complex/clog.c.
// The go code is a simplified version of the original C.
//
// Cephes Math Library Release 2.8:  June, 2000
// Copyright 1984, 1987, 1989, 1992, 2000 by Stephen L. Moshier
//
// The readme file at http://netlib.sandia.gov/cephes/ says:
//    Some software in this archive may be from the book _Methods and
// Programs for Mathematical Functions_ (Prentice-Hall or Simon & Schuster
// International, 1989) or from the Cephes Mathematical Library, a
// commercial product. In either event, it is copyrighted by the author.
// What you see here may be used freely but it comes with no support or
// guarantee.
//
//   The two known misprints in the book are repaired here in the
// source listings for the gamma function and the incomplete beta
// integral.
//
//   Stephen L. Moshier
//   moshier@na-net.ornl.gov

// Complex power function
//
// DESCRIPTION:
//
// Raises complex A to the complex Zth power.
// Definition is per AMS55 # 4.2.8,
// analytically equivalent to cpow(a,z) = cexp(z clog(a)).
//
// ACCURACY:
//
//                      Relative error:
// arithmetic   domain     # trials      peak         rms
//    IEEE      -10,+10     30000       9.4e-15     1.5e-15

// Pow returns x**y, the base-x exponential of y.
// For generalized compatibility with math.Pow:
//	Pow(0, ±0) returns 1+0i
//	Pow(0, c) for real(c)<0 returns Inf+0i if imag(c) is zero, otherwise Inf+Inf i.
func (,  complex128) complex128 {
if  == 0 { // Guaranteed also true for x == -0.
if IsNaN() {
return NaN()
}
,  := real(), imag()
switch {
case  == 0:
return 1
case  < 0:
if  == 0 {
return complex(math.Inf(1), 0)
}
return Inf()
case  > 0:
return 0
}
panic("not reached")
}
:= Abs()
if  == 0 {
return complex(0, 0)
}
:= math.Pow(, real())
:= Phase()
:= real() *
if imag() != 0 {
*= math.Exp(-imag() * )
+= imag() * math.Log()
}
,  := math.Sincos()
return complex(*, *)
}