1 // Copyright ©2015 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.
10 "golang.org/x/exp/rand"
12 "gonum.org/v1/gonum/floats"
15 type Dgeqrfer interface {
17 Dgeqrf(m, n int, a []float64, lda int, tau, work []float64, lwork int)
20 func DgeqrfTest(t *testing.T, impl Dgeqrfer) {
21 rnd := rand.New(rand.NewSource(1))
22 for c, test := range []struct {
52 a := make([]float64, m*lda)
53 for i := 0; i < m; i++ {
54 for j := 0; j < n; j++ {
55 a[i*lda+j] = rnd.Float64()
58 tau := make([]float64, n)
59 for i := 0; i < n; i++ {
60 tau[i] = rnd.Float64()
62 aCopy := make([]float64, len(a))
64 ans := make([]float64, len(a))
66 work := make([]float64, n)
67 // Compute unblocked QR.
68 impl.Dgeqr2(m, n, ans, lda, tau, work)
69 // Compute blocked QR with small work.
70 impl.Dgeqrf(m, n, a, lda, tau, work, len(work))
71 if !floats.EqualApprox(ans, a, 1e-12) {
72 t.Errorf("Case %v, mismatch small work.", c)
74 // Try the full length of work.
75 impl.Dgeqrf(m, n, a, lda, tau, work, -1)
77 work = make([]float64, lwork)
79 impl.Dgeqrf(m, n, a, lda, tau, work, lwork)
80 if !floats.EqualApprox(ans, a, 1e-12) {
81 t.Errorf("Case %v, mismatch large work.", c)
84 // Try a slightly smaller version of work to test blocking.
91 impl.Dgeqrf(m, n, a, lda, tau, work, lwork)
92 if !floats.EqualApprox(ans, a, 1e-12) {
93 t.Errorf("Case %v, mismatch large work.", c)