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 Dlaqp2er interface {
18 Dlaqp2(m, n, offset int, a []float64, lda int, jpvt []int, tau, vn1, vn2, work []float64)
21 func Dlaqp2Test(t *testing.T, impl Dlaqp2er) {
22 for ti, test := range []struct {
25 {m: 4, n: 3, offset: 0},
26 {m: 4, n: 3, offset: 2},
27 {m: 4, n: 3, offset: 4},
28 {m: 3, n: 4, offset: 0},
29 {m: 3, n: 4, offset: 1},
30 {m: 3, n: 4, offset: 2},
31 {m: 8, n: 3, offset: 0},
32 {m: 8, n: 3, offset: 4},
33 {m: 8, n: 3, offset: 8},
34 {m: 3, n: 8, offset: 0},
35 {m: 3, n: 8, offset: 1},
36 {m: 3, n: 8, offset: 2},
37 {m: 10, n: 10, offset: 0},
38 {m: 10, n: 10, offset: 5},
39 {m: 10, n: 10, offset: 10},
43 jpiv := make([]int, n)
45 for _, extra := range []int{0, 11} {
46 a := zeros(m, n, n+extra)
48 for i := 0; i < m; i++ {
49 for j := 0; j < n; j++ {
50 a.Data[i*a.Stride+j] = float64(c)
54 aCopy := cloneGeneral(a)
59 tau := make([]float64, n)
60 vn1 := columnNorms(m, n, a.Data, a.Stride)
61 vn2 := columnNorms(m, n, a.Data, a.Stride)
62 work := make([]float64, n)
64 impl.Dlaqp2(m, n, test.offset, a.Data, a.Stride, jpiv, tau, vn1, vn2, work)
66 prefix := fmt.Sprintf("Case %v (offset=%d,m=%v,n=%v,extra=%v)", ti, test.offset, m, n, extra)
67 if !generalOutsideAllNaN(a) {
68 t.Errorf("%v: out-of-range write to A", prefix)
76 q := constructQ("QR", mo, n, a.Data[test.offset*a.Stride:], a.Stride, tau)
77 // Check that q is orthonormal
78 for i := 0; i < mo; i++ {
79 nrm := blas64.Nrm2(mo, blas64.Vector{Inc: 1, Data: q.Data[i*mo:]})
80 if math.Abs(nrm-1) > 1e-13 {
81 t.Errorf("Case %v, q not normal", ti)
83 for j := 0; j < i; j++ {
84 dot := blas64.Dot(mo, blas64.Vector{Inc: 1, Data: q.Data[i*mo:]}, blas64.Vector{Inc: 1, Data: q.Data[j*mo:]})
85 if math.Abs(dot) > 1e-14 {
86 t.Errorf("Case %v, q not orthogonal", ti)
91 // Check that A * P = Q * R
96 Data: make([]float64, mo*n),
98 for i := 0; i < mo; i++ {
99 for j := i; j < n; j++ {
100 r.Data[i*n+j] = a.Data[(test.offset+i)*a.Stride+j]
103 got := nanGeneral(mo, n, n)
104 blas64.Gemm(blas.NoTrans, blas.NoTrans, 1, q, r, 0, got)
107 impl.Dlapmt(true, want.Rows, want.Cols, want.Data, want.Stride, jpiv)
109 want.Data = want.Data[test.offset*want.Stride:]
110 if !equalApproxGeneral(got, want, 1e-12) {
111 t.Errorf("Case %v, Q*R != A*P\nQ*R=%v\nA*P=%v", ti, got, want)