| // Copyright ©2017 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 ( |
| "math" |
| "math/rand" |
| "testing" |
| |
| "gonum.org/v1/gonum/blas/blas64" |
| ) |
| |
| func TestDlagsy(t *testing.T) { |
| const tol = 1e-14 |
| rnd := rand.New(rand.NewSource(1)) |
| for _, n := range []int{0, 1, 2, 3, 4, 5, 10, 50} { |
| for _, lda := range []int{0, 2*n + 1} { |
| if lda == 0 { |
| lda = max(1, n) |
| } |
| d := make([]float64, n) |
| for i := range d { |
| d[i] = 1 |
| } |
| a := blas64.General{ |
| Rows: n, |
| Cols: n, |
| Stride: lda, |
| Data: nanSlice(n * lda), |
| } |
| work := make([]float64, a.Rows+a.Cols) |
| |
| Dlagsy(a.Rows, 0, d, a.Data, a.Stride, rnd, work) |
| |
| isIdentity := true |
| identityLoop: |
| for i := 0; i < n; i++ { |
| for j := 0; j < n; j++ { |
| aij := a.Data[i*a.Stride+j] |
| if math.IsNaN(aij) { |
| isIdentity = false |
| } |
| if i == j && math.Abs(aij-1) > tol { |
| isIdentity = false |
| } |
| if i != j && math.Abs(aij) > tol { |
| isIdentity = false |
| } |
| if !isIdentity { |
| break identityLoop |
| } |
| } |
| } |
| if !isIdentity { |
| t.Errorf("Case n=%v,lda=%v: unexpected result", n, lda) |
| } |
| } |
| } |
| } |
| |
| func TestDlagge(t *testing.T) { |
| rnd := rand.New(rand.NewSource(1)) |
| for _, n := range []int{0, 1, 2, 3, 4, 5, 10, 50} { |
| for _, lda := range []int{0, 2*n + 1} { |
| if lda == 0 { |
| lda = max(1, n) |
| } |
| d := make([]float64, n) |
| for i := range d { |
| d[i] = 1 |
| } |
| a := blas64.General{ |
| Rows: n, |
| Cols: n, |
| Stride: lda, |
| Data: nanSlice(n * lda), |
| } |
| work := make([]float64, a.Rows+a.Cols) |
| |
| Dlagge(a.Rows, a.Cols, 0, 0, d, a.Data, a.Stride, rnd, work) |
| |
| if !isOrthonormal(a) { |
| t.Errorf("Case n=%v,lda=%v: unexpected result", n, lda) |
| } |
| } |
| } |
| |
| } |