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// Copyright ©2015 The Gonum 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 testlapack
import (
"math"
"testing"
)
type Dlas2er interface {
Dlas2(f, g, h float64) (min, max float64)
}
func Dlas2Test(t *testing.T, impl Dlas2er) {
for i, test := range []struct {
f, g, h, ssmin, ssmax float64
}{
// Singular values computed from Octave.
{10, 30, 12, 3.567778859365365, 33.634371616111189},
{10, 30, -12, 3.567778859365365, 33.634371616111189},
{2, 30, -12, 0.741557056404952, 32.364333658088754},
{-2, 5, 12, 1.842864429909778, 13.023204317408728},
} {
ssmin, ssmax := impl.Dlas2(test.f, test.g, test.h)
if math.Abs(ssmin-test.ssmin) > 1e-12 {
t.Errorf("Case %d, minimal singular value mismatch. Want %v, got %v", i, test.ssmin, ssmin)
}
if math.Abs(ssmax-test.ssmax) > 1e-12 {
t.Errorf("Case %d, minimal singular value mismatch. Want %v, got %v", i, test.ssmin, ssmin)
}
}
}
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