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[bytom/vapor.git] / vendor / gonum.org / v1 / gonum / lapack / testlapack / dgelqf.go

diff --git a/vendor/gonum.org/v1/gonum/lapack/testlapack/dgelqf.go b/vendor/gonum.org/v1/gonum/lapack/testlapack/dgelqf.go
new file mode 100644 (file)
index 0000000..91472d6
--- /dev/null
+++ b/vendor/gonum.org/v1/gonum/lapack/testlapack/dgelqf.go
@@ -0,0 +1,99 @@
+// 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"
+)
+
+type Dgelqfer interface {
+       Dgelq2er
+       Dgelqf(m, n int, a []float64, lda int, tau, work []float64, lwork int)
+}
+
+func DgelqfTest(t *testing.T, impl Dgelqfer) {
+       rnd := rand.New(rand.NewSource(1))
+       for c, test := range []struct {
+               m, n, lda int
+       }{
+               {10, 5, 0},
+               {5, 10, 0},
+               {10, 10, 0},
+               {300, 5, 0},
+               {3, 500, 0},
+               {200, 200, 0},
+               {300, 200, 0},
+               {204, 300, 0},
+               {1, 3000, 0},
+               {3000, 1, 0},
+               {10, 5, 30},
+               {5, 10, 30},
+               {10, 10, 30},
+               {300, 5, 500},
+               {3, 500, 600},
+               {200, 200, 300},
+               {300, 200, 300},
+               {204, 300, 400},
+               {1, 3000, 4000},
+               {3000, 1, 4000},
+       } {
+               m := test.m
+               n := test.n
+               lda := test.lda
+               if lda == 0 {
+                       lda = n
+               }
+               a := make([]float64, m*lda)
+               for i := 0; i < m; i++ {
+                       for j := 0; j < n; j++ {
+                               a[i*lda+j] = rnd.Float64()
+                       }
+               }
+               tau := make([]float64, n)
+               for i := 0; i < n; i++ {
+                       tau[i] = rnd.Float64()
+               }
+               aCopy := make([]float64, len(a))
+               copy(aCopy, a)
+               ans := make([]float64, len(a))
+               copy(ans, a)
+               work := make([]float64, m)
+               for i := range work {
+                       work[i] = rnd.Float64()
+               }
+               // Compute unblocked QR.
+               impl.Dgelq2(m, n, ans, lda, tau, work)
+               // Compute blocked QR with small work.
+               impl.Dgelqf(m, n, a, lda, tau, work, len(work))
+               if !floats.EqualApprox(ans, a, 1e-12) {
+                       t.Errorf("Case %v, mismatch small work.", c)
+               }
+               // Try the full length of work.
+               impl.Dgelqf(m, n, a, lda, tau, work, -1)
+               lwork := int(work[0])
+               work = make([]float64, lwork)
+               copy(a, aCopy)
+               impl.Dgelqf(m, n, a, lda, tau, work, lwork)
+               if !floats.EqualApprox(ans, a, 1e-12) {
+                       t.Errorf("Case %v, mismatch large work.", c)
+               }
+
+               // Try a slightly smaller version of work to test blocking code.
+               if len(work) <= m {
+                       continue
+               }
+               work = work[1:]
+               lwork--
+               copy(a, aCopy)
+               impl.Dgelqf(m, n, a, lda, tau, work, lwork)
+               if !floats.EqualApprox(ans, a, 1e-12) {
+                       t.Errorf("Case %v, mismatch large work.", c)
+               }
+       }
+}