github.com/gopherd/gonum@v0.0.4/blas/testblas/dspr2.go (about)

     1  // Copyright ©2014 The Gonum Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package testblas
     6  
     7  import (
     8  	"testing"
     9  
    10  	"github.com/gopherd/gonum/blas"
    11  	"github.com/gopherd/gonum/floats"
    12  )
    13  
    14  type Dspr2er interface {
    15  	Dspr2(ul blas.Uplo, n int, alpha float64, x []float64, incX int, y []float64, incY int, a []float64)
    16  }
    17  
    18  func Dspr2Test(t *testing.T, blasser Dspr2er) {
    19  	for i, test := range []struct {
    20  		n     int
    21  		a     [][]float64
    22  		ul    blas.Uplo
    23  		x     []float64
    24  		y     []float64
    25  		alpha float64
    26  		ans   [][]float64
    27  	}{
    28  		{
    29  			n: 3,
    30  			a: [][]float64{
    31  				{7, 2, 4},
    32  				{0, 3, 5},
    33  				{0, 0, 6},
    34  			},
    35  			x:     []float64{2, 3, 4},
    36  			y:     []float64{5, 6, 7},
    37  			alpha: 2,
    38  			ul:    blas.Upper,
    39  			ans: [][]float64{
    40  				{47, 56, 72},
    41  				{0, 75, 95},
    42  				{0, 0, 118},
    43  			},
    44  		},
    45  		{
    46  			n: 3,
    47  			a: [][]float64{
    48  				{7, 0, 0},
    49  				{2, 3, 0},
    50  				{4, 5, 6},
    51  			},
    52  			x:     []float64{2, 3, 4},
    53  			y:     []float64{5, 6, 7},
    54  			alpha: 2,
    55  			ul:    blas.Lower,
    56  			ans: [][]float64{
    57  				{47, 0, 0},
    58  				{56, 75, 0},
    59  				{72, 95, 118},
    60  			},
    61  		},
    62  	} {
    63  		incTest := func(incX, incY, extra int) {
    64  			aFlat := flattenTriangular(test.a, test.ul)
    65  			x := makeIncremented(test.x, incX, extra)
    66  			y := makeIncremented(test.y, incY, extra)
    67  			blasser.Dspr2(test.ul, test.n, test.alpha, x, incX, y, incY, aFlat)
    68  			ansFlat := flattenTriangular(test.ans, test.ul)
    69  			if !floats.EqualApprox(aFlat, ansFlat, 1e-14) {
    70  				t.Errorf("Case %v, incX = %v, incY = %v. Want %v, got %v.", i, incX, incY, ansFlat, aFlat)
    71  			}
    72  		}
    73  		incTest(1, 1, 0)
    74  		incTest(-2, 1, 0)
    75  		incTest(-2, 3, 0)
    76  		incTest(2, -3, 0)
    77  		incTest(3, -2, 0)
    78  		incTest(-3, -4, 0)
    79  	}
    80  }