1 // Copyright ©2016 The Gonum Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
11 "golang.org/x/exp/rand"
13 "gonum.org/v1/gonum/floats"
16 type Dlapy2er interface {
17 Dlapy2(float64, float64) float64
20 func Dlapy2Test(t *testing.T, impl Dlapy2er) {
21 rnd := rand.New(rand.NewSource(1))
22 for i := 0; i < 10; i++ {
23 x := math.Abs(1e200 * rnd.NormFloat64())
24 y := math.Abs(1e200 * rnd.NormFloat64())
25 got := impl.Dlapy2(x, y)
26 want := math.Hypot(x, y)
27 if !floats.EqualWithinRel(got, want, 1e-16) {
28 t.Errorf("Dlapy2(%g, %g) = %g, want %g", x, y, got, want)