blob: 8bcf2ddac2eaac1480998a2de3c2598bde3d8ae8 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
// Copyright 2009 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 math
/*
Floating-point hyperbolic tangent.
Sinh and Cosh are called except for large arguments, which
would cause overflow improperly.
*/
// Tanh computes the hyperbolic tangent of x.
func Tanh(x float64) float64 {
if x < 0 {
x = -x
if x > 21 {
return -1
}
return -Sinh(x) / Cosh(x)
}
if x > 21 {
return 1
}
return Sinh(x) / Cosh(x)
}
|
