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Merge branch 'rc'

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This commit is contained in:
dudaodong
2024-11-19 10:26:41 +08:00
parent b5e7312353 3be706e23f
commit 05f9854945
11 changed files with 628 additions and 127 deletions
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16
algorithm/lrucache_test.go
View File

@@ -8,7 +8,7 @@ import (
func TestLRUCache(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestLRUCache")
assert := internal.NewAssert(t, "TestLRUCache")
cache := NewLRUCache[int, int](3)
@@ -16,19 +16,19 @@ func TestLRUCache(t *testing.T) {
cache.Put(2, 2)
cache.Put(3, 3)
asssert.Equal(3, cache.Len())
assert.Equal(3, cache.Len())
v, ok := cache.Get(1)
asssert.Equal(true, ok)
asssert.Equal(1, v)
assert.Equal(true, ok)
assert.Equal(1, v)
v, ok = cache.Get(2)
asssert.Equal(true, ok)
asssert.Equal(2, v)
assert.Equal(true, ok)
assert.Equal(2, v)
ok = cache.Delete(2)
asssert.Equal(true, ok)
assert.Equal(true, ok)
_, ok = cache.Get(2)
asssert.Equal(false, ok)
assert.Equal(false, ok)
}

18
algorithm/search_test.go
View File

@@ -8,34 +8,34 @@ import (
func TestLinearSearch(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestLinearSearch")
assert := internal.NewAssert(t, "TestLinearSearch")
numbers := []int{3, 4, 5, 3, 2, 1}
equalFunc := func(a, b int) bool {
return a == b
}
asssert.Equal(0, LinearSearch(numbers, 3, equalFunc))
asssert.Equal(-1, LinearSearch(numbers, 6, equalFunc))
assert.Equal(0, LinearSearch(numbers, 3, equalFunc))
assert.Equal(-1, LinearSearch(numbers, 6, equalFunc))
}
func TestBinarySearch(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestBinarySearch")
assert := internal.NewAssert(t, "TestBinarySearch")
sortedNumbers := []int{1, 2, 3, 4, 5, 6, 7, 8}
comparator := &intComparator{}
asssert.Equal(4, BinarySearch(sortedNumbers, 5, 0, len(sortedNumbers)-1, comparator))
asssert.Equal(-1, BinarySearch(sortedNumbers, 9, 0, len(sortedNumbers)-1, comparator))
assert.Equal(4, BinarySearch(sortedNumbers, 5, 0, len(sortedNumbers)-1, comparator))
assert.Equal(-1, BinarySearch(sortedNumbers, 9, 0, len(sortedNumbers)-1, comparator))
}
func TestBinaryIterativeSearch(t *testing.T) {
asssert := internal.NewAssert(t, "TestBinaryIterativeSearch")
assert := internal.NewAssert(t, "TestBinaryIterativeSearch")
sortedNumbers := []int{1, 2, 3, 4, 5, 6, 7, 8}
comparator := &intComparator{}
asssert.Equal(4, BinaryIterativeSearch(sortedNumbers, 5, 0, len(sortedNumbers)-1, comparator))
asssert.Equal(-1, BinaryIterativeSearch(sortedNumbers, 9, 0, len(sortedNumbers)-1, comparator))
assert.Equal(4, BinaryIterativeSearch(sortedNumbers, 5, 0, len(sortedNumbers)-1, comparator))
assert.Equal(-1, BinaryIterativeSearch(sortedNumbers, 9, 0, len(sortedNumbers)-1, comparator))
}

36
algorithm/sort_test.go
View File

@@ -47,7 +47,7 @@ func (c *intComparator) Compare(v1 any, v2 any) int {
func TestBubbleSortForStructSlice(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestBubbleSortForStructSlice")
assert := internal.NewAssert(t, "TestBubbleSortForStructSlice")
peoples := []people{
{Name: "a", Age: 20},
@@ -62,23 +62,23 @@ func TestBubbleSortForStructSlice(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", peoples)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}
func TestBubbleSortForIntSlice(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestBubbleSortForIntSlice")
assert := internal.NewAssert(t, "TestBubbleSortForIntSlice")
numbers := []int{2, 1, 5, 3, 6, 4}
comparator := &intComparator{}
BubbleSort(numbers, comparator)
asssert.Equal([]int{1, 2, 3, 4, 5, 6}, numbers)
assert.Equal([]int{1, 2, 3, 4, 5, 6}, numbers)
}
func TestInsertionSort(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestInsertionSort")
assert := internal.NewAssert(t, "TestInsertionSort")
peoples := []people{
{Name: "a", Age: 20},
@@ -93,12 +93,12 @@ func TestInsertionSort(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", peoples)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}
func TestSelectionSort(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestSelectionSort")
assert := internal.NewAssert(t, "TestSelectionSort")
peoples := []people{
{Name: "a", Age: 20},
@@ -113,12 +113,12 @@ func TestSelectionSort(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", peoples)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}
func TestShellSort(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestShellSort")
assert := internal.NewAssert(t, "TestShellSort")
peoples := []people{
{Name: "a", Age: 20},
@@ -133,12 +133,12 @@ func TestShellSort(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", peoples)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}
func TestQuickSort(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestQuickSort")
assert := internal.NewAssert(t, "TestQuickSort")
peoples := []people{
{Name: "a", Age: 20},
@@ -153,12 +153,12 @@ func TestQuickSort(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", peoples)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}
func TestHeapSort(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestHeapSort")
assert := internal.NewAssert(t, "TestHeapSort")
peoples := []people{
{Name: "a", Age: 20},
@@ -173,12 +173,12 @@ func TestHeapSort(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", peoples)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}
func TestMergeSort(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestMergeSort")
assert := internal.NewAssert(t, "TestMergeSort")
peoples := []people{
{Name: "a", Age: 20},
@@ -193,12 +193,12 @@ func TestMergeSort(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", peoples)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}
func TestCountSort(t *testing.T) {
t.Parallel()
asssert := internal.NewAssert(t, "TestCountSort")
assert := internal.NewAssert(t, "TestCountSort")
peoples := []people{
{Name: "a", Age: 20},
@@ -213,5 +213,5 @@ func TestCountSort(t *testing.T) {
expected := "[{d 8} {b 10} {c 17} {a 20} {e 28}]"
actual := fmt.Sprintf("%v", sortedPeopleByAge)
asssert.Equal(expected, actual)
assert.Equal(expected, actual)
}

98
cryptor/rsa_private_example.pem
View File

@@ -1,51 +1,51 @@
-----BEGIN rsa private key-----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QAOZu65MMisctDu/v+wWxEIQhqWCmkh2O8rXvnWTUYqoAH3cSuRHTFnxBKk2jdob
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1G+MzGQ4dtpliMl9XPu0/fQRubdKyZIkMWx7sqDah9p38Tyxv/6YHINHkQEnxBhx
t+2qwdMPBar7a7oRvMRbuk6k79eJMv5i+uGsE44cpxA3XWyDRxTPsGJF3b7hYKHo
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Kj3KhvKKV9EkNiMZQIuoHoetNAHqthl+kwmMsaHauIBXrYtYz9eXq56d9SkN8gK+
BltkFkfDMtncP1h/Wr7RUDGUkw8UTWK2LHJYVqDh9xXmjHRqvX/JTef6A7susqBC
xW54XjtQibh9cnBMghY3kqCCHviohbZlAoIBAQCg+hW7o6kwyFa7Ahioaq05jZkc
FA/2reCv2jgU16JkyLcnSQffpLlkWxDOL+ae40YVJDldvzTBZBsDxfqaZzZL2ddQ
HuT3H28z5byMq72FTOxQo6E0H6K5RW1edAN8IW9u5weAFAka3Qsvvy23P5ZajiRR
hTRrIFR5+Nv888MuZ9UDfKdQIlahMvqUqE+//tqXSzL18aFB1ufYh6A8bvtB+Yrm
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HFzdr7uQkoog+LH4C2ZlIrBA7Hv7uJVrkY5BKg825Bg41UUjZrD2knsK3yyZ
MIIJKAIBAAKCAgEAymvyNgI0T1P/DnFA2FomMrx4SzBf9p4VJ70AyYmbdeGhtzh+
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Mi+sKqiqOWC/D0FVSclfugWw5/EBxJJSBSPYumLJelbk3PqXtVm46mvGnlQlfHGp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RXmzieyRoVc2JoOoaqwfI/lgRiaxfVgDcAjhMo2OXYZfGlxjlahyyF4Fy3MUvBeW
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MeJyh3hlPgzOpWleGoiXxliq1z57eZNT3hNUO1WqcUvTFUUq6gEHlgAoFB66KEGb
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gDVbi/391jU/Vw/0WHJX3yK3A48vkHH1LETNqco0kDXtGZOxY6wAJ03dfpK2/FPI
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Apg3YoYftkOpQy3UyMesz5o+XKtSPTgXYzT/G+dD+EWDhBBYeIHOyolOn0LRqTMg
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IkpuE7QxhD2r1WWSmsnKaP1WmYyfrcQefzBd4UN+0Amgq74qG9qfxXEzss1mAu+N
umO3suQ5BpFN9iVbmdAWC7SqAClPEZFHBMOd9B6nyBnv0Xp3Pclpk/ThPUTm2sxd
YvFEa8itw9NM0P2lXAYMM+ksFDThcf+sK+510+Du6aj/CZ5YhutRN0tbwNzN7ewT
QBGpCuEJ9XUjGxmE5YmKSDMPgBLOnjb4tywWwlYsndOnMpN6vpi+OZaZnZBqTiqF
9IZyUBoN+yHrFVF+O6ZZiSzSz8xSVhwoLTrBX3D2qrP02jg4sG1coiEX6iE=
-----END rsa private key-----

24
cryptor/rsa_public_example.pem
View File

@@ -1,14 +1,14 @@
-----BEGIN rsa public key-----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MIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAymvyNgI0T1P/DnFA2Fom
Mrx4SzBf9p4VJ70AyYmbdeGhtzh+u6zNoDQ2UMmDzcCbtv9JW7PX80O8xy/O006g
eNPfW74T5ryH2GEj3Y+eOtIzYI6gQy74JXqiqEztE6BkvesYHC+Yo8IIrawBBYHg
GvluAudTZPqnkcqnUd8ngfhahCQrMi+sKqiqOWC/D0FVSclfugWw5/EBxJJSBSPY
umLJelbk3PqXtVm46mvGnlQlfHGppYQ5Nj6zKilCgoJoAHURp4dAaOwAhVOtc31M
0WPre/9th4TodZu1GeqFt5HqmMeP5+p2GDNDSxDNP3lgCgSqwRzy4pYaE5e70azn
Os5iaclAAlrLN3aSK6lDT+BGQbQrQgM47x3flMfszqNeuaBwdiNyzEodhT8eiYl8
m08B1sVI811q7pG8WUVZjIYs2BzVjK/VDnvbEyayX+RGCAXr5M/bfDM1YRfVS9TW
xspQNB3pyxgLX//LJIATbutUVKcrjxjoS7GdEocSruTOm/J+ZMTm0EqhsbRHVm+7
GcsSLaiSACEq+ONQJsN1x1o2GGVEi3pEZnDITSsokdcyrBj1A9a5Hx4tSiMbg88g
S4MPOALzBTmEVneQC+U5HTG/erUpZk6/AhT9Flk3HQTNIdzz8a2Clfeh4GU1JoKB
4u++XPt4M5h75OWnd5r9HYUCAwEAAQ==
-----END rsa public key-----

156
docs/api/packages/mathutil.md
View File

@@ -33,7 +33,7 @@ import (
- [Percent](#Percent)
- [RoundToFloat](#RoundToFloat)
- [RoundToString](#RoundToString)
- [TruncRound](#TruncRound)
- [T运行cRound](#T运行cRound)
- [CeilToFloat](#CeilToFloat)
- [CeilToString](#CeilToString)
- [FloorToFloat](#FloorToFloat)
@@ -52,6 +52,10 @@ import (
- [Sum](#Sum)
- [Abs](#Abs)
- [Div](#Div)
- [Variance](#Variance)
- [StdDev](#StdDev)
- [Permutation](#Permutation)
- [Combination](#Combination)
<div STYLE="page-break-after: always;"></div>
@@ -64,7 +68,7 @@ import (
<b>函数签名:</b>
```go
func Average[T constraints.Integer | constraints.Float](numbers ...T) T
func Average[T constraints.Integer | constraints.Float](numbers ...T) float64
```
<b>示例:<span style="float:right;display:inline-block;">[运行](https://go.dev/play/p/HFd70x4DrMj)</span></b>
@@ -87,7 +91,7 @@ func main() {
fmt.Println(result2)
// Output:
// 1
// 1.5
// 1.3
}
```
@@ -462,14 +466,14 @@ func main() {
}
```
### <span id="TruncRound">TruncRound</span>
### <span id="T运行cRound">T运行cRound</span>
<p>截短n位小数（不进行四舍五入）</p>
<b>函数签名:</b>
```go
func TruncRound[T constraints.Float | constraints.Integer](x T, n int) T
func T运行cRound[T constraints.Float | constraints.Integer](x T, n int) T
```
<b>示例:<span style="float:right;display:inline-block;">[运行](https://go.dev/play/p/aumarSHIGzP)</span></b>
@@ -483,9 +487,9 @@ import (
)
func main() {
result1 := mathutil.TruncRound(0.124, 2)
result2 := mathutil.TruncRound(0.125, 2)
result3 := mathutil.TruncRound(0.125, 3)
result1 := mathutil.T运行cRound(0.124, 2)
result2 := mathutil.T运行cRound(0.125, 2)
result3 := mathutil.T运行cRound(0.125, 3)
fmt.Println(result1)
fmt.Println(result2)
@@ -1045,8 +1049,8 @@ import (
func main() {
result1 := mathutil.Log(8, 2)
result2 := mathutil.TruncRound(mathutil.Log(5, 2), 2)
result3 := mathutil.TruncRound(mathutil.Log(27, 3), 0)
result2 := mathutil.T运行cRound(mathutil.Log(5, 2), 2)
result3 := mathutil.T运行cRound(mathutil.Log(27, 3), 0)
fmt.Println(result1)
fmt.Println(result2)
@@ -1162,4 +1166,136 @@ func main() {
// 0.5
// 0
}
```
### <span id="Variance">Variance</span>
<p>计算方差。</p>
<b>函数签名:</b>
```go
func Variance[T constraints.Float | constraints.Integer](numbers []T) float64
```
<b>示例:<span style="float:right;display:inline-block;">[示例](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.Variance([]int{1, 2, 3, 4, 5})
result2 := mathutil.Variance([]float64{1.1, 2.2, 3.3, 4.4, 5.5})
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 2
// 2.42
}
```
### <span id="StdDev">StdDev</span>
<p>计算标准差。</p>
<b>函数签名:</b>
```go
func StdDev[T constraints.Float | constraints.Integer](numbers []T) float64
```
<b>示例:<span style="float:right;display:inline-block;">[运行](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.T运行cRound(mathutil.StdDev([]int{1, 2, 3, 4, 5}), 2)
result2 := mathutil.T运行cRound(mathutil.StdDev([]float64{1.1, 2.2, 3.3, 4.4, 5.5}), 2)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 1.41
// 1.55
}
```
### <span id="Permutation">Permutation</span>
<p>计算排列数（P(n, k)）。</p>
<b>函数签名:</b>
```go
func Permutation(n, k uint) uint
```
<b>示例:<span style="float:right;display:inline-block;">[运行](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.Permutation(5, 3)
result2 := mathutil.Permutation(5, 5)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 60
// 120
}
```
### <span id="Combination">Combination</span>
<p>计算组合数（C(n, k)）。</p>
<b>函数签名:</b>
```go
func Combination(n, k uint) uint
```
<b>示例:<span style="float:right;display:inline-block;">[运行](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.Combination(5, 3)
result2 := mathutil.Combination(5, 5)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 10
// 1
}
```

140
docs/en/api/packages/mathutil.md
View File

@@ -52,6 +52,10 @@ import (
- [Sum](#Sum)
- [Abs](#Abs)
- [Div](#Div)
- [Variance](#Variance)
- [StdDev](#StdDev)
- [Permutation](#Permutation)
- [Combination](#Combination)
<div STYLE="page-break-after: always;"></div>
@@ -64,7 +68,7 @@ import (
<b>Signature:</b>
```go
func Average[T constraints.Integer | constraints.Float](numbers ...T) T
func Average[T constraints.Integer | constraints.Float](numbers ...T) float64
```
<b>Example:<span style="float:right;display:inline-block;">[Run](https://go.dev/play/p/Vv7LBwER-pz)</span></b>
@@ -87,7 +91,7 @@ func main() {
fmt.Println(result2)
// Output:
// 1
// 1.5
// 1.3
}
```
@@ -1161,4 +1165,136 @@ func main() {
// 0.5
// 0
}
```
### <span id="Variance">Variance</span>
<p>Returns the variance of numbers.</p>
<b>Signature:</b>
```go
func Variance[T constraints.Float | constraints.Integer](numbers []T) float64
```
<b>Example:<span style="float:right;display:inline-block;">[Run](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.Variance([]int{1, 2, 3, 4, 5})
result2 := mathutil.Variance([]float64{1.1, 2.2, 3.3, 4.4, 5.5})
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 2
// 2.42
}
```
### <span id="StdDev">StdDev</span>
<p>Returns the standard deviation of numbers.</p>
<b>Signature:</b>
```go
func StdDev[T constraints.Float | constraints.Integer](numbers []T) float64
```
<b>Example:<span style="float:right;display:inline-block;">[Run](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.TruncRound(mathutil.StdDev([]int{1, 2, 3, 4, 5}), 2)
result2 := mathutil.TruncRound(mathutil.StdDev([]float64{1.1, 2.2, 3.3, 4.4, 5.5}), 2)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 1.41
// 1.55
}
```
### <span id="Permutation">Permutation</span>
<p>Calculates P(n, k).</p>
<b>Signature:</b>
```go
func Permutation(n, k uint) uint
```
<b>Example:<span style="float:right;display:inline-block;">[Run](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.Permutation(5, 3)
result2 := mathutil.Permutation(5, 5)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 60
// 120
}
```
### <span id="Combination">Combination</span>
<p>Calculates C(n, k).</p>
<b>Signature:</b>
```go
func Combination(n, k uint) uint
```
<b>Example:<span style="float:right;display:inline-block;">[Run](todo)</span></b>
```go
package main
import (
"fmt"
"github.com/duke-git/lancet/v2/mathutil"
)
func main() {
result1 := mathutil.Combination(5, 3)
result2 := mathutil.Combination(5, 5)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 10
// 1
}
```

80
mathutil/mathutil.go
View File

@@ -44,14 +44,19 @@ func Fibonacci(first, second, n int) int {
}
}
// Factorial calculate x!.
// Factorial calculate n!.
// Play: https://go.dev/play/p/tt6LdOK67Nx
func Factorial(x uint) uint {
var f uint = 1
for ; x > 1; x-- {
f *= x
func Factorial(n uint) uint {
if n == 0 || n == 1 {
return 1
}
return f
result := uint(1)
for i := uint(2); i <= n; i++ {
result *= i
}
return result
}
// Percent calculate the percentage of value to total.
@@ -224,14 +229,12 @@ func Sum[T constraints.Integer | constraints.Float](numbers ...T) T {
// Average return average value of numbers.
// Play: https://go.dev/play/p/Vv7LBwER-pz
func Average[T constraints.Integer | constraints.Float](numbers ...T) T {
var sum T
n := T(len(numbers))
for _, v := range numbers {
sum += v
func Average[T constraints.Integer | constraints.Float](numbers ...T) float64 {
var sum float64
for _, num := range numbers {
sum += float64(num)
}
return sum / n
return sum / float64(len(numbers))
}
// Range creates a slice of numbers from start with specified count, element step is 1.
@@ -395,3 +398,54 @@ func Abs[T constraints.Integer | constraints.Float](x T) T {
func Div[T constraints.Float | constraints.Integer](x T, y T) float64 {
return float64(x) / float64(y)
}
// Variance returns the variance of numbers.
// Play: todo
func Variance[T constraints.Float | constraints.Integer](numbers []T) float64 {
n := len(numbers)
if n == 0 {
return 0
}
avg := Average(numbers...)
var sum float64
for _, v := range numbers {
sum += (float64(v) - avg) * (float64(v) - avg)
}
return sum / float64(n)
}
// StdDev returns the standard deviation of numbers.
// Play: todo
func StdDev[T constraints.Float | constraints.Integer](numbers []T) float64 {
return math.Sqrt(Variance(numbers))
}
// Permutation calculate P(n, k).
// Play: todo
func Permutation(n, k uint) uint {
if n < k {
return 0
}
nFactorial := Factorial(n)
nMinusKFactorial := Factorial(n - k)
return nFactorial / nMinusKFactorial
}
// Combination calculate C(n, k).
// Play: todo
func Combination(n, k uint) uint {
if n < k {
return 0
}
nFactorial := Factorial(n)
kFactorial := Factorial(k)
nMinusKFactorial := Factorial(n - k)
return nFactorial / (kFactorial * nMinusKFactorial)
}

50
mathutil/mathutil_exmaple_test.go
View File

@@ -178,7 +178,7 @@ func ExampleAverage() {
fmt.Println(result2)
// Output:
// 1
// 1.5
// 1.3
}
@@ -478,3 +478,51 @@ func ExampleDiv() {
// 0.5
// 0
}
func ExampleVariance() {
result1 := Variance([]int{1, 2, 3, 4, 5})
result2 := Variance([]float64{1.1, 2.2, 3.3, 4.4, 5.5})
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 2
// 2.42
}
func ExampleStdDev() {
result1 := TruncRound(StdDev([]int{1, 2, 3, 4, 5}), 2)
result2 := TruncRound(StdDev([]float64{1.1, 2.2, 3.3, 4.4, 5.5}), 2)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 1.41
// 1.55
}
func ExamplePermutation() {
result1 := Permutation(5, 3)
result2 := Permutation(5, 5)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 60
// 120
}
func ExampleCombination() {
result1 := Combination(5, 3)
result2 := Combination(5, 5)
fmt.Println(result1)
fmt.Println(result2)
// Output:
// 10
// 1
}

132
mathutil/mathutil_test.go
View File

@@ -143,11 +143,22 @@ func TestAverage(t *testing.T) {
assert := internal.NewAssert(t, "TestAverage")
assert.Equal(0, Average(0, 0))
assert.Equal(1, Average(1, 1))
tests := []struct {
numbers []int
expected float64
}{
{[]int{0}, 0},
{[]int{1, 1, 1}, 1},
{[]int{1, 2, 3, 4}, 2.5},
{[]int{1, 2, 3, 4, 5}, 3},
}
avg := Average(1.2, 1.4)
assert.Equal(1.3, RoundToFloat(avg, 1))
for _, tt := range tests {
assert.Equal(tt.expected, Average(tt.numbers...))
}
avg := Average(1.1, 1.2, 1.3, 1.4)
assert.Equal(1.25, avg)
}
func TestSum(t *testing.T) {
@@ -413,3 +424,116 @@ func TestDiv(t *testing.T) {
assert.Equal(math.Inf(-1), Div(-8, 0))
assert.Equal(true, math.IsNaN(Div(0, 0)))
}
func TestVariance(t *testing.T) {
t.Parallel()
assert := internal.NewAssert(t, "TestVariance")
testIntNumbers := []struct {
numbers []int
expected float64
}{
{[]int{0}, 0},
{[]int{1, 1, 1}, 0},
{[]int{1, 2, 3, 4}, 1.25},
{[]int{1, 2, 3, 4, 5}, 2.0},
}
for _, tt := range testIntNumbers {
assert.Equal(tt.expected, TruncRound(Variance(tt.numbers), 2))
}
testFloatNumbers := []struct {
numbers []float64
expected float64
}{
{[]float64{0}, 0},
{[]float64{1, 1, 1}, 0},
{[]float64{1.1, 2.2, 3.3, 4.4}, 1.51},
}
for _, tt := range testFloatNumbers {
assert.Equal(tt.expected, TruncRound(Variance(tt.numbers), 2))
}
}
func TestStdDev(t *testing.T) {
t.Parallel()
assert := internal.NewAssert(t, "TestStdDev")
testIntNumbers := []struct {
numbers []int
expected float64
}{
{[]int{0}, 0},
{[]int{1, 1, 1}, 0},
{[]int{1, 2, 3, 4}, 1.118},
{[]int{1, 2, 3, 4, 5}, 1.414},
}
for _, tt := range testIntNumbers {
assert.Equal(tt.expected, TruncRound(StdDev(tt.numbers), 3))
}
testFloatNumbers := []struct {
numbers []float64
expected float64
}{
{[]float64{0}, 0},
{[]float64{1, 1, 1}, 0},
{[]float64{1.1, 2.2, 3.3, 4.4}, 1.229},
}
for _, tt := range testFloatNumbers {
assert.Equal(tt.expected, TruncRound(StdDev(tt.numbers), 3))
}
}
func TestPermutation(t *testing.T) {
t.Parallel()
assert := internal.NewAssert(t, "TestPermutation")
tests := []struct {
n uint
k uint
expected uint
}{
{1, 1, 1},
{1, 0, 1},
{0, 1, 0},
{0, 0, 1},
{3, 2, 6},
{4, 2, 12},
}
for _, tt := range tests {
assert.Equal(tt.expected, Permutation(tt.n, tt.k))
}
}
func TestCombination(t *testing.T) {
t.Parallel()
assert := internal.NewAssert(t, "TestCombination")
tests := []struct {
n uint
k uint
expected uint
}{
{1, 1, 1},
{1, 0, 1},
{0, 1, 0},
{0, 0, 1},
{3, 2, 3},
{4, 2, 6},
}
for _, tt := range tests {
assert.Equal(tt.expected, Combination(tt.n, tt.k))
}
}

5
random/random.go
View File

@@ -10,6 +10,7 @@ import (
"io"
"math"
"math/rand"
"os"
"time"
"unsafe"
@@ -274,7 +275,9 @@ func nearestPowerOfTwo(cap int) int {
// random generate a random string based on given string range.
func random(s string, length int) string {
// 确保随机数生成器的种子是动态的
rand.Seed(time.Now().UnixNano())
pid := os.Getpid()
timestamp := time.Now().UnixNano()
rand.Seed(int64(pid) + timestamp)
// 仿照strings.Builder
// 创建一个长度为 length 的字节切片