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35 lines
1009 B
Go
35 lines
1009 B
Go
// Copyright ©2015 The gonum Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package testlapack
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import (
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"math"
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"testing"
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)
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type Dlas2er interface {
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Dlas2(f, g, h float64) (min, max float64)
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}
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func Dlas2Test(t *testing.T, impl Dlas2er) {
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for i, test := range []struct {
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f, g, h, ssmin, ssmax float64
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}{
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// Singular values computed from Octave.
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{10, 30, 12, 3.567778859365365, 33.634371616111189},
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{10, 30, -12, 3.567778859365365, 33.634371616111189},
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{2, 30, -12, 0.741557056404952, 32.364333658088754},
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{-2, 5, 12, 1.842864429909778, 13.023204317408728},
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} {
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ssmin, ssmax := impl.Dlas2(test.f, test.g, test.h)
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if math.Abs(ssmin-test.ssmin) > 1e-12 {
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t.Errorf("Case %d, minimal singular value mismatch. Want %v, got %v", i, test.ssmin, ssmin)
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}
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if math.Abs(ssmax-test.ssmax) > 1e-12 {
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t.Errorf("Case %d, minimal singular value mismatch. Want %v, got %v", i, test.ssmin, ssmin)
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}
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}
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}
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