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// Copyright ©2019 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 mat
import (
"math/cmplx"
"testing"
"golang.org/x/exp/rand"
)
func TestCDenseNewAtSet(t *testing.T) {
t.Parallel()
for cas, test := range []struct {
a []complex128
rows, cols int
}{
{
a: []complex128{0, 0, 0,
0, 0, 0,
0, 0, 0},
rows: 3,
cols: 3,
},
} {
aCopy := make([]complex128, len(test.a))
copy(aCopy, test.a)
mZero := NewCDense(test.rows, test.cols, nil)
rows, cols := mZero.Dims()
if rows != test.rows {
t.Errorf("unexpected number of rows for test %d: got: %d want: %d", cas, rows, test.rows)
}
if cols != test.cols {
t.Errorf("unexpected number of cols for test %d: got: %d want: %d", cas, cols, test.cols)
}
m := NewCDense(test.rows, test.cols, aCopy)
for i := 0; i < test.rows; i++ {
for j := 0; j < test.cols; j++ {
v := m.At(i, j)
idx := i*test.rows + j
if v != test.a[idx] {
t.Errorf("unexpected get value for test %d at i=%d, j=%d: got: %v, want: %v", cas, i, j, v, test.a[idx])
}
add := complex(float64(i+1), float64(j+1))
m.Set(i, j, v+add)
if m.At(i, j) != test.a[idx]+add {
t.Errorf("unexpected set value for test %d at i=%d, j=%d: got: %v, want: %v", cas, i, j, v, test.a[idx]+add)
}
}
}
}
}
func TestCDenseConjElem(t *testing.T) {
t.Parallel()
rnd := rand.New(rand.NewSource(1))
for r := 1; r <= 8; r++ {
for c := 1; c <= 8; c++ {
const (
empty = iota
fit
sliced
self
)
for _, dst := range []int{empty, fit, sliced, self} {
const (
noTrans = iota
trans
conjTrans
bothHT
bothTH
)
for _, src := range []int{noTrans, trans, conjTrans, bothHT, bothTH} {
d := NewCDense(r, c, nil)
for i := 0; i < r; i++ {
for j := 0; j < c; j++ {
d.Set(i, j, complex(rnd.NormFloat64(), rnd.NormFloat64()))
}
}
var (
a CMatrix
op string
)
switch src {
case noTrans:
a = d
case trans:
r, c = c, r
a = d.T()
op = ".T"
case conjTrans:
r, c = c, r
a = d.H()
op = ".H"
case bothHT:
a = d.H().T()
op = ".H.T"
case bothTH:
a = d.T().H()
op = ".T.H"
default:
panic("invalid src op")
}
aCopy := NewCDense(r, c, nil)
aCopy.Copy(a)
var got *CDense
switch dst {
case empty:
got = &CDense{}
case fit:
got = NewCDense(r, c, nil)
case sliced:
got = NewCDense(r*2, c*2, nil).Slice(1, r+1, 1, c+1).(*CDense)
case self:
if r != c && (src == conjTrans || src == trans) {
continue
}
got = d
default:
panic("invalid dst size")
}
got.Conj(a)
for i := 0; i < r; i++ {
for j := 0; j < c; j++ {
if got.At(i, j) != cmplx.Conj(aCopy.At(i, j)) {
t.Errorf("unexpected results a%s[%d, %d] for r=%d c=%d %v != %v",
op, i, j, r, c, got.At(i, j), cmplx.Conj(a.At(i, j)),
)
}
}
}
}
}
}
}
}
func TestCDenseGrow(t *testing.T) {
t.Parallel()
m := &CDense{}
m = m.Grow(10, 10).(*CDense)
rows, cols := m.Dims()
capRows, capCols := m.Caps()
if rows != 10 {
t.Errorf("unexpected value for rows: got: %d want: 10", rows)
}
if cols != 10 {
t.Errorf("unexpected value for cols: got: %d want: 10", cols)
}
if capRows != 10 {
t.Errorf("unexpected value for capRows: got: %d want: 10", capRows)
}
if capCols != 10 {
t.Errorf("unexpected value for capCols: got: %d want: 10", capCols)
}
// Test grow within caps is in-place.
m.Set(1, 1, 1)
v := m.Slice(1, 5, 1, 5).(*CDense)
if v.At(0, 0) != m.At(1, 1) {
t.Errorf("unexpected viewed element value: got: %v want: %v", v.At(0, 0), m.At(1, 1))
}
v = v.Grow(5, 5).(*CDense)
if !CEqual(v, m.Slice(1, 10, 1, 10)) {
t.Error("unexpected view value after grow")
}
// Test grow bigger than caps copies.
v = v.Grow(5, 5).(*CDense)
if !CEqual(v.Slice(0, 9, 0, 9), m.Slice(1, 10, 1, 10)) {
t.Error("unexpected mismatched common view value after grow")
}
v.Set(0, 0, 0)
if CEqual(v.Slice(0, 9, 0, 9), m.Slice(1, 10, 1, 10)) {
t.Error("unexpected matching view value after grow past capacity")
}
// Test grow uses existing data slice when matrix is zero size.
v.Reset()
p, l := &v.mat.Data[:1][0], cap(v.mat.Data)
*p = 1 // This element is at position (-1, -1) relative to v and so should not be visible.
v = v.Grow(5, 5).(*CDense)
if &v.mat.Data[:1][0] != p {
t.Error("grow unexpectedly copied slice within cap limit")
}
if cap(v.mat.Data) != l {
t.Errorf("unexpected change in data slice capacity: got: %d want: %d", cap(v.mat.Data), l)
}
if v.At(0, 0) != 0 {
t.Errorf("unexpected value for At(0, 0): got: %v want: 0", v.At(0, 0))
}
}
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