lapack: imported lapack as a subtree

lapack/testlapack/dlasrt.go

@@ -0,0 +1,80 @@
+// Copyright ©2016 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"
+
+	"github.com/gonum/floats"
+	"github.com/gonum/lapack"
+)
+
+type Dlasrter interface {
+	Dlasrt(s lapack.Sort, n int, d []float64)
+}
+
+func DlasrtTest(t *testing.T, impl Dlasrter) {
+	for ti, test := range []struct {
+		data    []float64
+		wantInc []float64
+		wantDec []float64
+	}{
+		{
+			data:    nil,
+			wantInc: nil,
+			wantDec: nil,
+		},
+		{
+			data:    []float64{},
+			wantInc: []float64{},
+			wantDec: []float64{},
+		},
+		{
+			data:    []float64{1},
+			wantInc: []float64{1},
+			wantDec: []float64{1},
+		},
+		{
+			data:    []float64{1, 2},
+			wantInc: []float64{1, 2},
+			wantDec: []float64{2, 1},
+		},
+		{
+			data:    []float64{1, 2, -3},
+			wantInc: []float64{-3, 1, 2},
+			wantDec: []float64{2, 1, -3},
+		},
+		{
+			data:    []float64{-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5},
+			wantInc: []float64{-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5},
+			wantDec: []float64{5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5},
+		},
+		{
+			data:    []float64{5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5},
+			wantInc: []float64{-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5},
+			wantDec: []float64{5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5},
+		},
+		{
+			data:    []float64{-2, 4, -1, 2, -4, 0, 3, 5, -5, 1, -3},
+			wantInc: []float64{-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5},
+			wantDec: []float64{5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5},
+		},
+	} {
+		n := len(test.data)
+		ds := make([]float64, n)
+
+		copy(ds, test.data)
+		impl.Dlasrt(lapack.SortIncreasing, n, ds)
+		if !floats.Equal(ds, test.wantInc) {
+			t.Errorf("Case #%v: unexpected result of SortIncreasing", ti)
+		}
+
+		copy(ds, test.data)
+		impl.Dlasrt(lapack.SortDecreasing, n, ds)
+		if !floats.Equal(ds, test.wantDec) {
+			t.Errorf("Case #%v: unexpected result of SortIncreasing", ti)
+		}
+	}
+}