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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"
)
type Dsbmver interface {
Dsbmv(ul blas.Uplo, n, k int, alpha float64, a []float64, lda int, x []float64, incX int, beta float64, y []float64, incY int)
}
func DsbmvTest(t *testing.T, blasser Dsbmver) {
for i, test := range []struct {
ul blas.Uplo
n int
k int
alpha float64
beta float64
a [][]float64
x []float64
y []float64
ans []float64
}{
{
ul: blas.Upper,
n: 4,
k: 2,
alpha: 2,
beta: 3,
a: [][]float64{
{7, 8, 2, 0},
{0, 8, 2, -3},
{0, 0, 3, 6},
{0, 0, 0, 9},
},
x: []float64{1, 2, 3, 4},
y: []float64{-1, -2, -3, -4},
ans: []float64{55, 30, 69, 84},
},
{
ul: blas.Lower,
n: 4,
k: 2,
alpha: 2,
beta: 3,
a: [][]float64{
{7, 0, 0, 0},
{8, 8, 0, 0},
{2, 2, 3, 0},
{0, -3, 6, 9},
},
x: []float64{1, 2, 3, 4},
y: []float64{-1, -2, -3, -4},
ans: []float64{55, 30, 69, 84},
},
} {
extra := 0
var aFlat []float64
if test.ul == blas.Upper {
aFlat = flattenBanded(test.a, test.k, 0)
} else {
aFlat = flattenBanded(test.a, 0, test.k)
}
incTest := func(incX, incY, extra int) {
xnew := makeIncremented(test.x, incX, extra)
ynew := makeIncremented(test.y, incY, extra)
ans := makeIncremented(test.ans, incY, extra)
blasser.Dsbmv(test.ul, test.n, test.k, test.alpha, aFlat, test.k+1, xnew, incX, test.beta, ynew, incY)
if !dSliceTolEqual(ans, ynew) {
t.Errorf("Case %v: Want %v, got %v", i, ans, ynew)
}
}
incTest(1, 1, extra)
incTest(1, 3, extra)
incTest(1, -3, extra)
incTest(2, 3, extra)
incTest(2, -3, extra)
incTest(3, 2, extra)
incTest(-3, 2, extra)
}
}
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