lapack: imported lapack as a subtree

lapack/testlapack/dlacpy.go

@@ -0,0 +1,89 @@
+// 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 (
+	"fmt"
+	"math/rand"
+	"testing"
+
+	"github.com/gonum/blas"
+)
+
+type Dlacpyer interface {
+	Dlacpy(uplo blas.Uplo, m, n int, a []float64, lda int, b []float64, ldb int)
+}
+
+func DlacpyTest(t *testing.T, impl Dlacpyer) {
+	rnd := rand.New(rand.NewSource(1))
+	for _, uplo := range []blas.Uplo{blas.Upper, blas.Lower, blas.All} {
+		for _, test := range []struct {
+			m, n, lda, ldb int
+		}{
+			{3, 5, 0, 0},
+			{5, 5, 0, 0},
+			{7, 5, 0, 0},
+
+			{3, 5, 10, 12},
+			{5, 5, 10, 12},
+			{7, 5, 10, 12},
+		} {
+			m := test.m
+			n := test.n
+			lda := test.lda
+			if lda == 0 {
+				lda = n
+			}
+			ldb := test.ldb
+			if ldb == 0 {
+				ldb = n
+			}
+			a := make([]float64, m*lda)
+			for i := range a {
+				a[i] = rnd.Float64()
+			}
+			b := make([]float64, m*ldb)
+			for i := range b {
+				b[i] = rnd.Float64()
+			}
+			impl.Dlacpy(uplo, m, n, a, lda, b, ldb)
+			equal := true
+			switch uplo {
+			case blas.Upper:
+				for i := 0; i < m; i++ {
+					for j := i; j < n; j++ {
+						if b[i*ldb+j] != a[i*lda+j] {
+							equal = false
+							goto DoneCheck
+						}
+					}
+				}
+			case blas.Lower:
+				for i := 0; i < m; i++ {
+					for j := 0; j < min(i, n); j++ {
+						if b[i*ldb+j] != a[i*lda+j] {
+							equal = false
+							goto DoneCheck
+						}
+					}
+				}
+			case blas.All:
+				for i := 0; i < m; i++ {
+					for j := 0; j < n; j++ {
+						if b[i*ldb+j] != a[i*lda+j] {
+							equal = false
+							goto DoneCheck
+						}
+					}
+				}
+			}
+		DoneCheck:
+			if !equal {
+				fmt.Println(blas.Lower)
+				t.Errorf("Matrices not equal after copy. Uplo = %d, m = %d, n = %d", uplo, m, n)
+			}
+		}
+	}
+}