| // Copyright ©2016 The Gonum Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package testlapack |
| |
| import ( |
| "testing" |
| |
| "golang.org/x/exp/rand" |
| |
| "gonum.org/v1/gonum/blas/blas64" |
| ) |
| |
| type Dorg2ler interface { |
| Dorg2l(m, n, k int, a []float64, lda int, tau, work []float64) |
| Dgeql2er |
| } |
| |
| func Dorg2lTest(t *testing.T, impl Dorg2ler) { |
| const tol = 1e-14 |
| |
| rnd := rand.New(rand.NewSource(1)) |
| for _, test := range []struct { |
| m, n, k, lda int |
| }{ |
| {5, 4, 3, 0}, |
| {5, 4, 4, 0}, |
| {3, 3, 2, 0}, |
| {5, 5, 5, 0}, |
| {5, 4, 3, 11}, |
| {5, 4, 4, 11}, |
| {3, 3, 2, 11}, |
| {5, 5, 5, 11}, |
| } { |
| m := test.m |
| n := test.n |
| k := test.k |
| lda := test.lda |
| if lda == 0 { |
| lda = n |
| } |
| |
| a := make([]float64, m*lda) |
| for i := range a { |
| a[i] = rnd.NormFloat64() |
| } |
| tau := nanSlice(max(m, n)) |
| work := make([]float64, n) |
| impl.Dgeql2(m, n, a, lda, tau, work) |
| |
| impl.Dorg2l(m, n, k, a, lda, tau[n-k:], work) |
| |
| q := blas64.General{Rows: m, Cols: n, Data: a, Stride: lda} |
| if resid := residualOrthogonal(q, false); resid > tol { |
| t.Errorf("Case m=%v, n=%v, k=%v, lda=%v: columns of Q not orthonormal; resid=%v, want<=%v", m, n, k, lda, resid, tol) |
| } |
| } |
| } |