1 // Copyright ©2017 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.
12 "gonum.org/v1/gonum/blas"
13 "gonum.org/v1/gonum/blas/blas64"
16 type Dlaqpser interface {
18 Dlaqps(m, n, offset, nb int, a []float64, lda int, jpvt []int, tau, vn1, vn2, auxv, f []float64, ldf int) (kb int)
21 func DlaqpsTest(t *testing.T, impl Dlaqpser) {
22 for ti, test := range []struct {
25 {m: 4, n: 3, nb: 2, offset: 0},
26 {m: 4, n: 3, nb: 1, offset: 2},
27 {m: 3, n: 4, nb: 2, offset: 0},
28 {m: 3, n: 4, nb: 1, offset: 2},
29 {m: 8, n: 3, nb: 2, offset: 0},
30 {m: 8, n: 3, nb: 1, offset: 4},
31 {m: 3, n: 8, nb: 2, offset: 0},
32 {m: 3, n: 8, nb: 1, offset: 1},
33 {m: 10, n: 10, nb: 3, offset: 0},
34 {m: 10, n: 10, nb: 2, offset: 5},
38 jpiv := make([]int, n)
40 for _, extra := range []int{0, 11} {
41 a := zeros(m, n, n+extra)
43 for i := 0; i < m; i++ {
44 for j := 0; j < n; j++ {
45 a.Data[i*a.Stride+j] = float64(c)
49 aCopy := cloneGeneral(a)
54 tau := make([]float64, n)
55 vn1 := columnNorms(m, n, a.Data, a.Stride)
56 vn2 := columnNorms(m, n, a.Data, a.Stride)
57 auxv := make([]float64, test.nb)
58 f := zeros(test.n, test.nb, n)
60 kb := impl.Dlaqps(m, n, test.offset, test.nb, a.Data, a.Stride, jpiv, tau, vn1, vn2, auxv, f.Data, f.Stride)
62 prefix := fmt.Sprintf("Case %v (offset=%d,m=%v,n=%v,extra=%v)", ti, test.offset, m, n, extra)
63 if !generalOutsideAllNaN(a) {
64 t.Errorf("%v: out-of-range write to A", prefix)
72 q := constructQ("QR", mo, kb, a.Data[test.offset*a.Stride:], a.Stride, tau)
73 // Check that q is orthonormal
74 for i := 0; i < mo; i++ {
75 nrm := blas64.Nrm2(mo, blas64.Vector{Inc: 1, Data: q.Data[i*mo:]})
76 if math.Abs(nrm-1) > 1e-13 {
77 t.Errorf("Case %v, q not normal", ti)
79 for j := 0; j < i; j++ {
80 dot := blas64.Dot(mo, blas64.Vector{Inc: 1, Data: q.Data[i*mo:]}, blas64.Vector{Inc: 1, Data: q.Data[j*mo:]})
81 if math.Abs(dot) > 1e-14 {
82 t.Errorf("Case %v, q not orthogonal", ti)
87 // Check that A * P = Q * R
92 Data: make([]float64, mo*kb),
94 for i := 0; i < mo; i++ {
95 for j := i; j < kb; j++ {
96 r.Data[i*kb+j] = a.Data[(test.offset+i)*a.Stride+j]
99 got := nanGeneral(mo, kb, kb)
100 blas64.Gemm(blas.NoTrans, blas.NoTrans, 1, q, r, 0, got)
103 impl.Dlapmt(true, want.Rows, want.Cols, want.Data, want.Stride, jpiv)
106 want.Data = want.Data[test.offset*want.Stride:]
107 if !equalApproxGeneral(got, want, 1e-12) {
108 t.Errorf("Case %v, Q*R != A*P\nQ*R=%v\nA*P=%v", ti, got, want)