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// 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 cmplx

import "math"

// IsNaN returns true if either real(x) or imag(x) is NaN

// and neither is an infinity.

func IsNaN(x complex128) bool {

        switch {

        case math.IsInf(real(x), 0) || math.IsInf(imag(x), 0):

                return false

        case math.IsNaN(real(x)) || math.IsNaN(imag(x)):

                return true

        }

        return false

}

// NaN returns a complex ``not-a-number'' value.

func NaN() complex128 {

        nan := math.NaN()

        return complex(nan, nan)

}