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// Copyright ©2014 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 testblas
import (
"testing"
"gonum.org/v1/gonum/blas"
"gonum.org/v1/gonum/floats"
)
type Dtrsver interface {
Dtrsv(ul blas.Uplo, tA blas.Transpose, d blas.Diag, n int, a []float64, lda int, x []float64, incX int)
}
func DtrsvTest(t *testing.T, blasser Dtrsver) {
for i, test := range []struct {
n int
a [][]float64
ul blas.Uplo
tA blas.Transpose
d blas.Diag
x []float64
ans []float64
}{
{
n: 3,
a: [][]float64{
{1, 2, 3},
{0, 8, 15},
{0, 0, 8},
},
ul: blas.Upper,
tA: blas.NoTrans,
d: blas.NonUnit,
x: []float64{5, 6, 7},
ans: []float64{4.15625, -0.890625, 0.875},
},
{
n: 3,
a: [][]float64{
{1, 2, 3},
{0, 1, 15},
{0, 0, 1},
},
ul: blas.Upper,
tA: blas.NoTrans,
d: blas.Unit,
x: []float64{5, 6, 7},
ans: []float64{182, -99, 7},
},
{
n: 3,
a: [][]float64{
{1, 0, 0},
{2, 8, 0},
{3, 15, 8},
},
ul: blas.Lower,
tA: blas.NoTrans,
d: blas.NonUnit,
x: []float64{5, 6, 7},
ans: []float64{5, -0.5, -0.0625},
},
{
n: 3,
a: [][]float64{
{1, 0, 0},
{2, 8, 0},
{3, 15, 8},
},
ul: blas.Lower,
tA: blas.NoTrans,
d: blas.Unit,
x: []float64{5, 6, 7},
ans: []float64{5, -4, 52},
},
{
n: 3,
a: [][]float64{
{1, 2, 3},
{0, 8, 15},
{0, 0, 8},
},
ul: blas.Upper,
tA: blas.Trans,
d: blas.NonUnit,
x: []float64{5, 6, 7},
ans: []float64{5, -0.5, -0.0625},
},
{
n: 3,
a: [][]float64{
{1, 2, 3},
{0, 8, 15},
{0, 0, 8},
},
ul: blas.Upper,
tA: blas.Trans,
d: blas.Unit,
x: []float64{5, 6, 7},
ans: []float64{5, -4, 52},
},
{
n: 3,
a: [][]float64{
{1, 0, 0},
{2, 8, 0},
{3, 15, 8},
},
ul: blas.Lower,
tA: blas.Trans,
d: blas.NonUnit,
x: []float64{5, 6, 7},
ans: []float64{4.15625, -0.890625, 0.875},
},
{
n: 3,
a: [][]float64{
{1, 0, 0},
{2, 1, 0},
{3, 15, 1},
},
ul: blas.Lower,
tA: blas.Trans,
d: blas.Unit,
x: []float64{5, 6, 7},
ans: []float64{182, -99, 7},
},
} {
incTest := func(incX, extra int) {
aFlat := flatten(test.a)
x := makeIncremented(test.x, incX, extra)
blasser.Dtrsv(test.ul, test.tA, test.d, test.n, aFlat, test.n, x, incX)
ans := makeIncremented(test.ans, incX, extra)
if !floats.EqualApprox(x, ans, 1e-14) {
t.Errorf("Case %v, incX = %v: Want %v, got %v.", i, incX, ans, x)
}
}
incTest(1, 0)
incTest(-2, 0)
incTest(3, 0)
incTest(-3, 8)
incTest(4, 2)
}
}
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