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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
963 bytes
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dim_asm.go
344 bytes
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dim_noasm.go
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dim_riscv64.s
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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_noasm.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
499 bytes
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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
2.91 KB
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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
13.6 KB
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j1.go
13.3 KB
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jn.go
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ldexp.go
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lgamma.go
11.03 KB
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log.go
3.86 KB
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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
259 bytes
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log_s390x.s
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log_stub.go
292 bytes
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logb.go
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mod.go
903 bytes
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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
326 bytes
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modf_ppc64x.s
416 bytes
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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
302 bytes
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sin.go
6.35 KB
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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
3.68 KB
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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: tanh.go
Close
// 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 // The original C code, the long comment, and the constants // below were from http://netlib.sandia.gov/cephes/cmath/sin.c, // available from http://www.netlib.org/cephes/cmath.tgz. // The go code is a simplified version of the original C. // tanh.c // // Hyperbolic tangent // // SYNOPSIS: // // double x, y, tanh(); // // y = tanh( x ); // // DESCRIPTION: // // Returns hyperbolic tangent of argument in the range MINLOG to MAXLOG. // MAXLOG = 8.8029691931113054295988e+01 = log(2**127) // MINLOG = -8.872283911167299960540e+01 = log(2**-128) // // A rational function is used for |x| < 0.625. The form // x + x**3 P(x)/Q(x) of Cody & Waite is employed. // Otherwise, // tanh(x) = sinh(x)/cosh(x) = 1 - 2/(exp(2x) + 1). // // ACCURACY: // // Relative error: // arithmetic domain # trials peak rms // IEEE -2,2 30000 2.5e-16 5.8e-17 // // Cephes Math Library Release 2.8: June, 2000 // Copyright 1984, 1987, 1989, 1992, 2000 by Stephen L. Moshier // // The readme file at http://netlib.sandia.gov/cephes/ says: // Some software in this archive may be from the book _Methods and // Programs for Mathematical Functions_ (Prentice-Hall or Simon & Schuster // International, 1989) or from the Cephes Mathematical Library, a // commercial product. In either event, it is copyrighted by the author. // What you see here may be used freely but it comes with no support or // guarantee. // // The two known misprints in the book are repaired here in the // source listings for the gamma function and the incomplete beta // integral. // // Stephen L. Moshier // moshier@na-net.ornl.gov // var tanhP = [...]float64{ -9.64399179425052238628e-1, -9.92877231001918586564e1, -1.61468768441708447952e3, } var tanhQ = [...]float64{ 1.12811678491632931402e2, 2.23548839060100448583e3, 4.84406305325125486048e3, } // Tanh returns the hyperbolic tangent of x. // // Special cases are: // // Tanh(±0) = ±0 // Tanh(±Inf) = ±1 // Tanh(NaN) = NaN func Tanh(x float64) float64 { if haveArchTanh { return archTanh(x) } return tanh(x) } func tanh(x float64) float64 { const MAXLOG = 8.8029691931113054295988e+01 // log(2**127) z := Abs(x) switch { case z > 0.5*MAXLOG: if x < 0 { return -1 } return 1 case z >= 0.625: s := Exp(2 * z) z = 1 - 2/(s+1) if x < 0 { z = -z } default: if x == 0 { return x } s := x * x z = x + x*s*((tanhP[0]*s+tanhP[1])*s+tanhP[2])/(((s+tanhQ[0])*s+tanhQ[1])*s+tanhQ[2]) } return z }