vendor/gonum.org/v1/gonum/blas/testblas/dzasum.go

   1 // Copyright ©2017 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         "golang.org/x/exp/rand"
  11
  12         "gonum.org/v1/gonum/floats"
  13 )
  14
  15 type Dzasumer interface {
  16         Dzasum(n int, x []complex128, incX int) float64
  17 }
  18
  19 func DzasumTest(t *testing.T, impl Dzasumer) {
  20         const tol = 1e-14
  21         rnd := rand.New(rand.NewSource(1))
  22         for _, n := range []int{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 50, 100} {
  23                 for _, incX := range []int{-5, 1, 2, 10} {
  24                         aincX := abs(incX)
  25                         var x []complex128
  26                         if n > 0 {
  27                                 x = make([]complex128, (n-1)*aincX+1)
  28                         }
  29                         for i := range x {
  30                                 x[i] = znan
  31                         }
  32                         for i := 0; i < n; i++ {
  33                                 re := float64(2*i + 1)
  34                                 if rnd.Intn(2) == 0 {
  35                                         re *= -1
  36                                 }
  37                                 im := float64(2 * (i + 1))
  38                                 if rnd.Intn(2) == 0 {
  39                                         im *= -1
  40                                 }
  41                                 x[i*aincX] = complex(re, im)
  42                         }
  43
  44                         want := float64(n * (2*n + 1))
  45                         got := impl.Dzasum(n, x, incX)
  46
  47                         if incX < 0 {
  48                                 if got != 0 {
  49                                         t.Errorf("Case n=%v,incX=%v: non-zero result when incX < 0. got %v", n, incX, got)
  50                                 }
  51                                 continue
  52                         }
  53                         if !floats.EqualWithinAbsOrRel(got, want, tol, tol) {
  54                                 t.Errorf("Case n=%v,incX=%v: unexpected result. want %v, got %v", n, incX, want, got)
  55                         }
  56                 }
  57         }
  58 }