| // 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 Dorg2rer interface { |
| Dgeqrfer |
| Dorg2r(m, n, k int, a []float64, lda int, tau []float64, work []float64) |
| } |
| |
| func Dorg2rTest(t *testing.T, impl Dorg2rer) { |
| rnd := rand.New(rand.NewSource(1)) |
| for ti, test := range []struct { |
| m, n, k, lda int |
| }{ |
| {3, 3, 0, 0}, |
| {4, 3, 0, 0}, |
| {3, 3, 2, 0}, |
| {4, 3, 2, 0}, |
| |
| {5, 5, 0, 20}, |
| {5, 5, 3, 20}, |
| {10, 5, 0, 20}, |
| {10, 5, 2, 20}, |
| } { |
| m := test.m |
| n := test.n |
| lda := test.lda |
| if lda == 0 { |
| lda = test.n |
| } |
| // Allocate m×n matrix A and fill it with random numbers. |
| a := make([]float64, m*lda) |
| for i := range a { |
| a[i] = rnd.NormFloat64() |
| } |
| |
| // Compute the QR decomposition of A. |
| tau := make([]float64, min(m, n)) |
| work := make([]float64, 1) |
| impl.Dgeqrf(m, n, a, lda, tau, work, -1) |
| work = make([]float64, int(work[0])) |
| impl.Dgeqrf(m, n, a, lda, tau, work, len(work)) |
| |
| // Compute the matrix Q explicitly using the first k elementary reflectors. |
| k := test.k |
| if k == 0 { |
| k = n |
| } |
| q := constructQK("QR", m, n, k, a, lda, tau) |
| |
| // Compute the matrix Q using Dorg2r. |
| impl.Dorg2r(m, n, k, a, lda, tau, work) |
| |
| // Check that the first n columns of both results match. |
| same := true |
| loop: |
| 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 loop |
| } |
| } |
| } |
| if !same { |
| t.Errorf("Case %v: Q mismatch", ti) |
| } |
| } |
| } |