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60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
// Copyright ©2016 The Gonum Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package testlapack
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import (
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"testing"
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"golang.org/x/exp/rand"
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"gonum.org/v1/gonum/blas/blas64"
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)
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type Dorg2ler interface {
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Dorg2l(m, n, k int, a []float64, lda int, tau, work []float64)
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Dgeql2er
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}
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func Dorg2lTest(t *testing.T, impl Dorg2ler) {
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const tol = 1e-14
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rnd := rand.New(rand.NewSource(1))
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for _, test := range []struct {
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m, n, k, lda int
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}{
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{5, 4, 3, 0},
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{5, 4, 4, 0},
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{3, 3, 2, 0},
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{5, 5, 5, 0},
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{5, 4, 3, 11},
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{5, 4, 4, 11},
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{3, 3, 2, 11},
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{5, 5, 5, 11},
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} {
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m := test.m
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n := test.n
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k := test.k
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lda := test.lda
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if lda == 0 {
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lda = n
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}
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a := make([]float64, m*lda)
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for i := range a {
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a[i] = rnd.NormFloat64()
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}
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tau := nanSlice(max(m, n))
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work := make([]float64, n)
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impl.Dgeql2(m, n, a, lda, tau, work)
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impl.Dorg2l(m, n, k, a, lda, tau[n-k:], work)
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q := blas64.General{Rows: m, Cols: n, Data: a, Stride: lda}
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if resid := residualOrthogonal(q, false); resid > tol {
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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)
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}
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}
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}
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