From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libgo/go/cmath/exp.go | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 libgo/go/cmath/exp.go (limited to 'libgo/go/cmath/exp.go') diff --git a/libgo/go/cmath/exp.go b/libgo/go/cmath/exp.go new file mode 100644 index 000000000..64c1ef409 --- /dev/null +++ b/libgo/go/cmath/exp.go @@ -0,0 +1,55 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package cmath + +import "math" + +// 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 exponential function +// +// DESCRIPTION: +// +// Returns the complex exponential of the complex argument z. +// +// If +// z = x + iy, +// r = exp(x), +// then +// w = r cos y + i r sin y. +// +// ACCURACY: +// +// Relative error: +// arithmetic domain # trials peak rms +// DEC -10,+10 8700 3.7e-17 1.1e-17 +// IEEE -10,+10 30000 3.0e-16 8.7e-17 + +// Exp returns e**x, the base-e exponential of x. +func Exp(x complex128) complex128 { + r := math.Exp(real(x)) + s, c := math.Sincos(imag(x)) + return complex(r*c, r*s) +} -- cgit v1.2.3