src/pkg/cmath/rect.go

// 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"

// Rect returns the complex number x with polar coordinates r, θ.
func Rect(r, θ float64) complex128 {
	s, c := math.Sincos(θ)
	return cmplx(r*c, r*s)
}