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Mathutil

mathutil 包实现了一些数学计算的函数.

源码:

https://github.com/duke-git/lancet/blob/main/mathutil/mathutil.go

用法:

import (
    "github.com/duke-git/lancet/v2/mathutil"
)

文档

Average

计算平均数. 可能需要对结果调用RoundToFloat方法四舍五入

函数签名:

func Average[T constraints.Integer | constraints.Float](numbers ...T) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Average(1, 2)

    avg := mathutil.Average(1.2, 1.4)
    result2 := mathutil.RoundToFloat(avg, 1)

    fmt.Println(result1)
    fmt.Println(result2)

    // Output:
    // 1
    // 1.3
}

Exponent

指数计算（x的n次方）

函数签名:

func Exponent(x, n int64) int64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Exponent(10, 0)
    result2 := mathutil.Exponent(10, 1)
    result3 := mathutil.Exponent(10, 2)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 1
    // 10
    // 100
}

Fibonacci

计算斐波那契数列的第n个数

函数签名:

func Fibonacci(first, second, n int) int

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Fibonacci(1, 1, 1)
    result2 := mathutil.Fibonacci(1, 1, 2)
    result3 := mathutil.Fibonacci(1, 1, 5)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 1
    // 1
    // 5
}

Factorial

计算阶乘

函数签名:

func Factorial(x uint) uint

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Factorial(1)
    result2 := mathutil.Factorial(2)
    result3 := mathutil.Factorial(3)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 1
    // 2
    // 6
}

Max

返回参数中的最大数

函数签名:

func Max[T constraints.Integer | constraints.Float](numbers ...T) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Max(1, 2, 3)
    result2 := mathutil.Max(1.2, 1.4, 1.1, 1.4)

    fmt.Println(result1)
    fmt.Println(result2)

    // Output:
    // 3
    // 1.4
}

MaxBy

使用给定的比较器函数返回切片的最大值

函数签名:

func MaxBy[T any](slice []T, comparator func(T, T) bool) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.MaxBy([]string{"a", "ab", "abc"}, func(v1, v2 string) bool {
        return len(v1) > len(v2)
    })

    result2 := mathutil.MaxBy([]string{"abd", "abc", "ab"}, func(v1, v2 string) bool {
        return len(v1) > len(v2)
    })

    result3 := mathutil.MaxBy([]string{}, func(v1, v2 string) bool {
        return len(v1) > len(v2)
    })

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // abc
    // abd
    //
}

Min

返回参数中的最小数

函数签名:

func Min[T constraints.Integer | constraints.Float](numbers ...T) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Min(1, 2, 3)
    result2 := mathutil.Min(1.2, 1.4, 1.1, 1.4)

    fmt.Println(result1)
    fmt.Println(result2)

    // Output:
    // 1
    // 1.1
}

MinBy

使用给定的比较器函数返回切片的最小值

函数签名:

func MinBy[T any](slice []T, comparator func(T, T) bool) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.MinBy([]string{"a", "ab", "abc"}, func(v1, v2 string) bool {
        return len(v1) < len(v2)
    })

    result2 := mathutil.MinBy([]string{"ab", "ac", "abc"}, func(v1, v2 string) bool {
        return len(v1) < len(v2)
    })

    result3 := mathutil.MinBy([]string{}, func(v1, v2 string) bool {
        return len(v1) < len(v2)
    })

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // a
    // ab
    //
}

Percent

计算百分比，保留n位小数

函数签名:

func Percent(val, total float64, n int) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Percent(1, 2, 2)
    result2 := mathutil.Percent(0.1, 0.3, 2)
    result3 := mathutil.Percent(-30305, 408420, 2)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 50
    // 33.33
    // -7.42
}

RoundToFloat

四舍五入，保留n位小数

函数签名:

func RoundToFloat(x float64, n int) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.RoundToFloat(0.124, 2)
    result2 := mathutil.RoundToFloat(0.125, 2)
    result3 := mathutil.RoundToFloat(0.125, 3)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 0.12
    // 0.13
    // 0.125
}

RoundToString

四舍五入，保留n位小数，返回字符串

函数签名:

func RoundToString(x float64, n int) string

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.RoundToString(0.124, 2)
    result2 := mathutil.RoundToString(0.125, 2)
    result3 := mathutil.RoundToString(0.125, 3)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 0.12
    // 0.13
    // 0.125
}

TruncRound

截短n位小数（不进行四舍五入）

函数签名:

func TruncRound(x float64, n int) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.TruncRound(0.124, 2)
    result2 := mathutil.TruncRound(0.125, 2)
    result3 := mathutil.TruncRound(0.125, 3)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 0.12
    // 0.12
    // 0.125
}

Range

根据指定的起始值和数量，创建一个数字切片。

函数签名:

func Range[T constraints.Integer | constraints.Float](start T, count int) []T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Range(1, 4)
    result2 := mathutil.Range(1, -4)
    result3 := mathutil.Range(-4, 4)
    result4 := mathutil.Range(1.0, 4)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)
    fmt.Println(result4)

    // Output:
    // [1 2 3 4]
    // [1 2 3 4]
    // [-4 -3 -2 -1]
    // [1 2 3 4]
}

RangeWithStep

根据指定的起始值，结束值，步长，创建一个数字切片。

函数签名:

func RangeWithStep[T constraints.Integer | constraints.Float](start, end, step T) []T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.RangeWithStep(1, 4, 1)
    result2 := mathutil.RangeWithStep(1, -1, 0)
    result3 := mathutil.RangeWithStep(-4, 1, 2)
    result4 := mathutil.RangeWithStep(1.0, 4.0, 1.1)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)
    fmt.Println(result4)

    // Output:
    // [1 2 3]
    // []
    // [-4 -2 0]
    // [1 2.1 3.2]
}

AngleToRadian

将角度值转为弧度值

函数签名:

func AngleToRadian(angle float64) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.AngleToRadian(45)
    result2 := mathutil.AngleToRadian(90)
    result3 := mathutil.AngleToRadian(180)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 0.7853981633974483
    // 1.5707963267948966
    // 3.141592653589793
}

RadianToAngle

将弧度值转为角度值

函数签名:

func RadianToAngle(radian float64) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.RadianToAngle(math.Pi)
    result2 := mathutil.RadianToAngle(math.Pi / 2)
    result3 := mathutil.RadianToAngle(math.Pi / 4)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 180
    // 90
    // 45
}

PointDistance

计算两个坐标点的距离

函数签名:

func PointDistance(x1, y1, x2, y2 float64) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.PointDistance(1, 1, 4, 5)

    fmt.Println(result1)

    // Output:
    // 5
}

IsPrime

判断质数。

函数签名:

func IsPrime(n int) bool

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.IsPrime(-1)
    result2 := mathutil.IsPrime(0)
    result3 := mathutil.IsPrime(1)
    result4 := mathutil.IsPrime(2)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)
    fmt.Println(result4)

    // Output:
    // false
    // false
    // false
    // true
}

GCD

计算最大公约数。

函数签名:

func GCD[T constraints.Integer](integers ...T) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.GCD(1, 1)
    result2 := mathutil.GCD(1, -1)
    result3 := mathutil.GCD(-1, 1)
    result4 := mathutil.GCD(-1, -1)
    result5 := mathutil.GCD(3, 6, 9)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)
    fmt.Println(result4)
    fmt.Println(result5)

    // Output:
    // 1
    // 1
    // -1
    // -1
    // 3
}

LCM

计算最小公倍数。

函数签名:

func LCM[T constraints.Integer](integers ...T) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.LCM(1, 1)
    result2 := mathutil.LCM(1, 2)
    result3 := mathutil.LCM(3, 6, 9)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 1
    // 2
    // 18
}

Cos

计算弧度的余弦值

函数签名:

func Cos(radian float64, precision ...int) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Cos(0)
    result2 := mathutil.Cos(90)
    result3 := mathutil.Cos(180)
    result4 := mathutil.Cos(math.Pi)
    result5 := mathutil.Cos(math.Pi / 2)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)
    fmt.Println(result4)
    fmt.Println(result5)

    // Output:
    // 1
    // -0.447
    // -0.598
    // -1
    // 0
}

Sin

计算弧度的正弦值

函数签名:

func Sin(radian float64, precision ...int) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Sin(0)
    result2 := mathutil.Sin(90)
    result3 := mathutil.Sin(180)
    result4 := mathutil.Sin(math.Pi)
    result5 := mathutil.Sin(math.Pi / 2)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)
    fmt.Println(result4)
    fmt.Println(result5)

    // Output:
    // 0
    // 0.894
    // -0.801
    // 0
    // 1
}

Log

计算以base为底n的对数。

函数签名:

func Log(n, base float64) float64

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Log(8, 2)
    result2 := mathutil.TruncRound(mathutil.Log(5, 2), 2)
    result3 := mathutil.TruncRound(mathutil.Log(27, 3), 0)

    fmt.Println(result1)
    fmt.Println(result2)
    fmt.Println(result3)

    // Output:
    // 3
    // 2.32
    // 3
}

Sum

求传入参数之和。

函数签名:

func Sum[T constraints.Integer | constraints.Float](numbers ...T) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := mathutil.Sum(1, 2)
    result2 := mathutil.Sum(0.1, float64(1))

    fmt.Println(result1)
    fmt.Println(result2)

    // Output:
    // 3
    // 1.1
}

Abs

求绝对值。

函数签名:

func Abs[T constraints.Integer | constraints.Float](x T) T

示例:运行

package main

import (
    "fmt"
    "github.com/duke-git/lancet/v2/mathutil"
)

func main() {
    result1 := Abs(-1)
	result2 := Abs(-0.1)
	result3 := Abs(float32(0.2))

	fmt.Println(result1)
	fmt.Println(result2)
	fmt.Println(result3)

	// Output:
	// 1
	// 0.1
	// 0.2
}

17 KiB Raw Blame History Unescape Escape

Mathutil

源码:

用法:

目录

文档

Average

Exponent

Fibonacci

Factorial

Max

MaxBy

Min

MinBy

Percent

RoundToFloat

RoundToString

TruncRound

Range

RangeWithStep

AngleToRadian

RadianToAngle

PointDistance

IsPrime

GCD

LCM

Cos

Sin

Log

Sum

Abs

17 KiB

Raw Blame History