19 lines
409 B
Go
19 lines
409 B
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package mathx
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// Sign returns the sign of x: -1 if x < 0, 0 if x == 0, 1 if x > 0.
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// If x is NaN, it returns NaN.
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func Sign(x float64) float64 {
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if x == 0 {
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return 0
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} else if x < 0 {
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return -1
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} else if x > 0 {
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return 1
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}
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return nan
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}
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