| // 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 ( |
| "math" |
| "math/rand" |
| "testing" |
| |
| "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) { |
| 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}, |
| } { |
| 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) |
| |
| aCopy := make([]float64, len(a)) |
| copy(aCopy, a) |
| impl.Dorg2l(m, n, k, a, lda, tau[n-k:], work) |
| if !hasOrthonormalColumns(m, n, a, lda) { |
| t.Errorf("Q is not orthonormal. m = %v, n = %v, k = %v", m, n, k) |
| } |
| } |
| } |
| |
| // hasOrthornormalColumns checks that the columns of a are orthonormal. |
| func hasOrthonormalColumns(m, n int, a []float64, lda int) bool { |
| for i := 0; i < n; i++ { |
| for j := i; j < n; j++ { |
| dot := blas64.Dot(m, |
| blas64.Vector{Inc: lda, Data: a[i:]}, |
| blas64.Vector{Inc: lda, Data: a[j:]}, |
| ) |
| if i == j { |
| if math.Abs(dot-1) > 1e-10 { |
| return false |
| } |
| } else { |
| if math.Abs(dot) > 1e-10 { |
| return false |
| } |
| } |
| } |
| } |
| return true |
| } |