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// Copyright ©2015 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/floats/scalar"
)
type Dorgl2er interface {
Dgelqfer
Dorgl2(m, n, k int, a []float64, lda int, tau []float64, work []float64)
}
func Dorgl2Test(t *testing.T, impl Dorgl2er) {
rnd := rand.New(rand.NewSource(1))
for _, test := range []struct {
m, n, lda int
}{
{3, 3, 0},
{3, 4, 0},
{5, 5, 20},
{5, 10, 20},
} {
m := test.m
n := test.n
lda := test.lda
if lda == 0 {
lda = test.n
}
a := make([]float64, m*lda)
for i := range a {
a[i] = rnd.NormFloat64()
}
k := min(m, n)
tau := make([]float64, k)
work := make([]float64, 1)
impl.Dgelqf(m, n, a, lda, tau, work, -1)
work = make([]float64, int(work[0]))
impl.Dgelqf(m, n, a, lda, tau, work, len(work))
q := constructQ("LQ", m, n, a, lda, tau)
impl.Dorgl2(m, n, k, a, lda, tau, work)
// Check that the first m rows match.
same := true
for i := 0; i < m; i++ {
for j := 0; j < n; j++ {
if !scalar.EqualWithinAbsOrRel(q.Data[i*q.Stride+j], a[i*lda+j], 1e-12, 1e-12) {
same = false
break
}
}
}
if !same {
t.Errorf("Q mismatch")
}
}
}
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