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December 17, 2015 18:18
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Approximate hyperbolic tangent function (-15x-, nevermind, post Go 1.1 only 2x faster than `math.tanh`)
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| func ApproxTanh(x float64) float64 { | |
| if x > 21 { | |
| return 1 | |
| } | |
| if x < -21 { | |
| return -1 | |
| } | |
| if x == +0 { | |
| return +0 | |
| } | |
| if x == -0 { | |
| return -0 | |
| } | |
| return x * (x*x + 27) / (9*x*x + 27) | |
| } |
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