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.
10 "golang.org/x/exp/rand"
12 "gonum.org/v1/gonum/blas"
13 "gonum.org/v1/gonum/blas/blas64"
14 "gonum.org/v1/gonum/lapack"
17 type Dggsvp3er interface {
19 Dggsvp3(jobU, jobV, jobQ lapack.GSVDJob, m, p, n int, a []float64, lda int, b []float64, ldb int, tola, tolb float64, u []float64, ldu int, v []float64, ldv int, q []float64, ldq int, iwork []int, tau, work []float64, lwork int) (k, l int)
22 func Dggsvp3Test(t *testing.T, impl Dggsvp3er) {
23 rnd := rand.New(rand.NewSource(1))
24 for cas, test := range []struct {
25 m, p, n, lda, ldb, ldu, ldv, ldq int
27 {m: 3, p: 3, n: 5, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
28 {m: 5, p: 5, n: 5, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
29 {m: 5, p: 5, n: 5, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
30 {m: 5, p: 5, n: 10, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
31 {m: 5, p: 5, n: 10, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
32 {m: 5, p: 5, n: 10, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
33 {m: 10, p: 5, n: 5, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
34 {m: 10, p: 5, n: 5, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
35 {m: 10, p: 10, n: 10, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
36 {m: 10, p: 10, n: 10, lda: 0, ldb: 0, ldu: 0, ldv: 0, ldq: 0},
37 {m: 5, p: 5, n: 5, lda: 10, ldb: 10, ldu: 10, ldv: 10, ldq: 10},
38 {m: 5, p: 5, n: 5, lda: 10, ldb: 10, ldu: 10, ldv: 10, ldq: 10},
39 {m: 5, p: 5, n: 10, lda: 20, ldb: 20, ldu: 10, ldv: 10, ldq: 20},
40 {m: 5, p: 5, n: 10, lda: 20, ldb: 20, ldu: 10, ldv: 10, ldq: 20},
41 {m: 5, p: 5, n: 10, lda: 20, ldb: 20, ldu: 10, ldv: 10, ldq: 20},
42 {m: 10, p: 5, n: 5, lda: 10, ldb: 10, ldu: 20, ldv: 10, ldq: 10},
43 {m: 10, p: 5, n: 5, lda: 10, ldb: 10, ldu: 20, ldv: 10, ldq: 10},
44 {m: 10, p: 10, n: 10, lda: 20, ldb: 20, ldu: 20, ldv: 20, ldq: 20},
45 {m: 10, p: 10, n: 10, lda: 20, ldb: 20, ldu: 20, ldv: 20, ldq: 20},
71 a := randomGeneral(m, n, lda, rnd)
72 aCopy := cloneGeneral(a)
73 b := randomGeneral(p, n, ldb, rnd)
74 bCopy := cloneGeneral(b)
76 tola := float64(max(m, n)) * impl.Dlange(lapack.NormFrob, m, n, a.Data, a.Stride, nil) * dlamchE
77 tolb := float64(max(p, n)) * impl.Dlange(lapack.NormFrob, p, n, b.Data, b.Stride, nil) * dlamchE
79 u := nanGeneral(m, m, ldu)
80 v := nanGeneral(p, p, ldv)
81 q := nanGeneral(n, n, ldq)
83 iwork := make([]int, n)
84 tau := make([]float64, n)
87 impl.Dggsvp3(lapack.GSVDU, lapack.GSVDV, lapack.GSVDQ,
99 work = make([]float64, lwork)
101 k, l := impl.Dggsvp3(lapack.GSVDU, lapack.GSVDV, lapack.GSVDQ,
112 // Check orthogonality of U, V and Q.
113 if !isOrthonormal(u) {
114 t.Errorf("test %d: U is not orthogonal\n%+v", cas, u)
116 if !isOrthonormal(v) {
117 t.Errorf("test %d: V is not orthogonal\n%+v", cas, v)
119 if !isOrthonormal(q) {
120 t.Errorf("test %d: Q is not orthogonal\n%+v", cas, q)
123 zeroA, zeroB := constructGSVPresults(n, p, m, k, l, a, b)
125 // Check U^T*A*Q = [ 0 RA ].
126 uTmp := nanGeneral(m, n, n)
127 blas64.Gemm(blas.Trans, blas.NoTrans, 1, u, aCopy, 0, uTmp)
128 uAns := nanGeneral(m, n, n)
129 blas64.Gemm(blas.NoTrans, blas.NoTrans, 1, uTmp, q, 0, uAns)
131 if !equalApproxGeneral(uAns, zeroA, 1e-14) {
132 t.Errorf("test %d: U^T*A*Q != [ 0 RA ]\nU^T*A*Q:\n%+v\n[ 0 RA ]:\n%+v",
136 // Check V^T*B*Q = [ 0 RB ].
137 vTmp := nanGeneral(p, n, n)
138 blas64.Gemm(blas.Trans, blas.NoTrans, 1, v, bCopy, 0, vTmp)
139 vAns := nanGeneral(p, n, n)
140 blas64.Gemm(blas.NoTrans, blas.NoTrans, 1, vTmp, q, 0, vAns)
142 if !equalApproxGeneral(vAns, zeroB, 1e-14) {
143 t.Errorf("test %d: V^T*B*Q != [ 0 RB ]\nV^T*B*Q:\n%+v\n[ 0 RB ]:\n%+v",