1 // Copyright ©2016 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 "golang.org/x/exp/rand"
14 "gonum.org/v1/gonum/blas"
15 "gonum.org/v1/gonum/blas/blas64"
18 type Dlasy2er interface {
19 Dlasy2(tranl, tranr bool, isgn, n1, n2 int, tl []float64, ldtl int, tr []float64, ldtr int, b []float64, ldb int, x []float64, ldx int) (scale, xnorm float64, ok bool)
22 func Dlasy2Test(t *testing.T, impl Dlasy2er) {
23 rnd := rand.New(rand.NewSource(1))
24 for _, tranl := range []bool{true, false} {
25 for _, tranr := range []bool{true, false} {
26 for _, isgn := range []int{1, -1} {
27 for _, n1 := range []int{0, 1, 2} {
28 for _, n2 := range []int{0, 1, 2} {
29 for _, extra := range []int{0, 1, 2, 13} {
30 for cas := 0; cas < 1000; cas++ {
31 testDlasy2(t, impl, tranl, tranr, isgn, n1, n2, extra, rnd)
41 func testDlasy2(t *testing.T, impl Dlasy2er, tranl, tranr bool, isgn, n1, n2, extra int, rnd *rand.Rand) {
44 tl := randomGeneral(n1, n1, n1+extra, rnd)
45 tr := randomGeneral(n2, n2, n2+extra, rnd)
46 b := randomGeneral(n1, n2, n2+extra, rnd)
47 x := randomGeneral(n1, n2, n2+extra, rnd)
49 scale, xnorm, ok := impl.Dlasy2(tranl, tranr, isgn, n1, n2, tl.Data, tl.Stride, tr.Data, tr.Stride, b.Data, b.Stride, x.Data, x.Stride)
51 t.Errorf("invalid value of scale, want <= 1, got %v", scale)
53 if n1 == 0 || n2 == 0 {
57 prefix := fmt.Sprintf("Case n1=%v, n2=%v, isgn=%v", n1, n2, isgn)
59 // Check any invalid modifications of x.
60 if !generalOutsideAllNaN(x) {
61 t.Errorf("%v: out-of-range write to x\n%v", prefix, x.Data)
65 for i := 0; i < n1; i++ {
67 for j := 0; j < n2; j++ {
68 rowsum += math.Abs(x.Data[i*x.Stride+j])
70 if rowsum > xnormWant {
74 if xnormWant != xnorm {
75 t.Errorf("%v: unexpected xnorm: want %v, got %v", prefix, xnormWant, xnorm)
78 // Multiply b by scale to get the wanted right-hand side.
79 for i := 0; i < n1; i++ {
80 for j := 0; j < n2; j++ {
81 b.Data[i*b.Stride+j] *= scale
84 // Compute the wanted left-hand side.
85 lhsWant := randomGeneral(n1, n2, n2, rnd)
87 blas64.Gemm(blas.Trans, blas.NoTrans, 1, tl, x, 0, lhsWant)
89 blas64.Gemm(blas.NoTrans, blas.NoTrans, 1, tl, x, 0, lhsWant)
92 blas64.Gemm(blas.NoTrans, blas.Trans, float64(isgn), x, tr, 1, lhsWant)
94 blas64.Gemm(blas.NoTrans, blas.NoTrans, float64(isgn), x, tr, 1, lhsWant)
97 for i := 0; i < n1; i++ {
98 for j := 0; j < n2; j++ {
99 diff := lhsWant.Data[i*lhsWant.Stride+j] - b.Data[i*b.Stride+j]
100 if math.Abs(diff) > tol && ok {
101 t.Errorf("%v: unexpected result, diff[%v,%v]=%v", prefix, i, j, diff)