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math: fix pow10 comment, test portable Sqrt

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R=r
CC= golang-dev, Charlie Dorian, golang-dev
https://golang.org/cl/184058
This commit is contained in:
Russ Cox 2010-01-11 11:25:37 -08:00
parent 0ed728c48a
commit 093146b920
3 changed files with 17 additions and 5 deletions
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11
src/pkg/math/all_test.go
View File

@ -307,7 +307,6 @@ func alike(a, b float64) bool {
func TestAcos(t *testing.T) {
for i := 0; i < len(vf); i++ {
// if f := Acos(vf[i] / 10); !veryclose(acos[i], f) {
if f := Acos(vf[i] / 10); !close(acos[i], f) {
t.Errorf("Acos(%g) = %g, want %g\n", vf[i]/10, f, acos[i])
}
@ -405,8 +404,12 @@ func TestSinh(t *testing.T) {
func TestSqrt(t *testing.T) {
for i := 0; i < len(vf); i++ {
a := Fabs(vf[i])
if f := Sqrt(a); !veryclose(sqrt[i], f) {
t.Errorf("Sqrt(%g) = %g, want %g\n", a, f, floor[i])
if f := SqrtGo(a); sqrt[i] != f {
t.Errorf("sqrtGo(%g) = %g, want %g\n", a, f, sqrt[i])
}
a = Fabs(vf[i])
if f := Sqrt(a); sqrt[i] != f {
t.Errorf("Sqrt(%g) = %g, want %g\n", a, f, sqrt[i])
}
}
}
@ -430,7 +433,7 @@ func TestTanh(t *testing.T) {
func TestHypot(t *testing.T) {
for i := 0; i < len(vf); i++ {
a := Fabs(tanh[i] * Sqrt(2))
if f := Hypot(tanh[i], tanh[i]); !veryclose(a, f) {
if f := Hypot(tanh[i], tanh[i]); a != f {
t.Errorf("Hypot(%g, %g) = %g, want %g\n", tanh[i], tanh[i], f, a)
}
}

2
src/pkg/math/pow10.go
View File

@ -15,7 +15,7 @@ package math
var pow10tab [70]float64
// Pow10 returns 10**x, the base-10 exponential of x.
// Pow10 returns 10**e, the base-10 exponential of e.
func Pow10(e int) float64 {
if e < 0 {
return 1 / Pow10(-e)

9
src/pkg/math/sqrt_test.go Normal file
View File

@ -0,0 +1,9 @@
// 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
// Make sqrtGo available for testing.
func SqrtGo(x float64) float64 { return sqrtGo(x) }