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02/02/2024 06:09:55 PM
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abs.go
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acos_s390x.s
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acosh.go
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acosh_s390x.s
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all_test.go
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arith_s390x.go
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arith_s390x_test.go
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asin.go
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asin_s390x.s
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asinh.go
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asinh_s390x.s
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atan.go
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atan2.go
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atan2_s390x.s
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atan_s390x.s
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atanh.go
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atanh_s390x.s
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big
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bits
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bits.go
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cbrt.go
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cbrt_s390x.s
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cmplx
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const.go
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const_test.go
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copysign.go
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cosh_s390x.s
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dim.go
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dim_amd64.s
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dim_arm64.s
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dim_asm.go
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dim_noasm.go
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dim_s390x.s
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erf.go
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erf_s390x.s
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erfc_s390x.s
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erfinv.go
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example_test.go
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exp.go
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exp2_asm.go
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exp2_noasm.go
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exp_amd64.go
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exp_amd64.s
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exp_arm64.s
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exp_asm.go
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exp_s390x.s
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expm1.go
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expm1_s390x.s
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export_s390x_test.go
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export_test.go
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floor.go
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floor_386.s
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floor_amd64.s
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floor_arm64.s
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floor_asm.go
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floor_noasm.go
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floor_ppc64x.s
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floor_s390x.s
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floor_wasm.s
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fma.go
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frexp.go
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gamma.go
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huge_test.go
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hypot.go
850 bytes
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hypot_386.s
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hypot_amd64.s
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hypot_asm.go
264 bytes
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hypot_noasm.go
297 bytes
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j0.go
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j1.go
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jn.go
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ldexp.go
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lgamma.go
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log.go
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log10.go
873 bytes
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log10_s390x.s
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log1p.go
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log1p_s390x.s
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log_amd64.s
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log_asm.go
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log_s390x.s
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log_stub.go
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logb.go
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mod.go
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modf.go
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modf_arm64.s
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modf_asm.go
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modf_noasm.go
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modf_ppc64x.s
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nextafter.go
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pow.go
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pow10.go
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pow_s390x.s
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rand
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remainder.go
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signbit.go
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sin.go
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sin_s390x.s
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sincos.go
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sinh.go
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sinh_s390x.s
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sqrt.go
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stubs.go
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stubs_s390x.s
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tan.go
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tan_s390x.s
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tanh.go
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tanh_s390x.s
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trig_reduce.go
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unsafe.go
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Editing: atanh.go
Close
// 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 math // The original C code, the long comment, and the constants // below are from FreeBSD's /usr/src/lib/msun/src/e_atanh.c // and came with this notice. The go code is a simplified // version of the original C. // // ==================================================== // Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. // // Developed at SunPro, a Sun Microsystems, Inc. business. // Permission to use, copy, modify, and distribute this // software is freely granted, provided that this notice // is preserved. // ==================================================== // // // __ieee754_atanh(x) // Method : // 1. Reduce x to positive by atanh(-x) = -atanh(x) // 2. For x>=0.5 // 1 2x x // atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------) // 2 1 - x 1 - x // // For x<0.5 // atanh(x) = 0.5*log1p(2x+2x*x/(1-x)) // // Special cases: // atanh(x) is NaN if |x| > 1 with signal; // atanh(NaN) is that NaN with no signal; // atanh(+-1) is +-INF with signal. // // Atanh returns the inverse hyperbolic tangent of x. // // Special cases are: // // Atanh(1) = +Inf // Atanh(±0) = ±0 // Atanh(-1) = -Inf // Atanh(x) = NaN if x < -1 or x > 1 // Atanh(NaN) = NaN func Atanh(x float64) float64 { if haveArchAtanh { return archAtanh(x) } return atanh(x) } func atanh(x float64) float64 { const NearZero = 1.0 / (1 << 28) // 2**-28 // special cases switch { case x < -1 || x > 1 || IsNaN(x): return NaN() case x == 1: return Inf(1) case x == -1: return Inf(-1) } sign := false if x < 0 { x = -x sign = true } var temp float64 switch { case x < NearZero: temp = x case x < 0.5: temp = x + x temp = 0.5 * Log1p(temp+temp*x/(1-x)) default: temp = 0.5 * Log1p((x+x)/(1-x)) } if sign { temp = -temp } return temp }