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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") } } }