/
number.go
728 lines (617 loc) · 16.3 KB
/
number.go
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package kgo
import (
"fmt"
"math"
"math/rand"
"reflect"
"strconv"
"time"
)
// AbsFloat 浮点型取绝对值.
func (kn *LkkNumber) AbsFloat(number float64) float64 {
return math.Abs(number)
}
// AbsInt 整型取绝对值.
func (kn *LkkNumber) AbsInt(number int64) int64 {
r := number >> 63
return (number ^ r) - r
}
// Range 根据范围创建数组,包含指定的元素.
// start为起始元素值,end为末尾元素值.若start<end,返回升序的数组;若start>end,返回降序的数组.
func (kn *LkkNumber) Range(start, end int) []int {
res := make([]int, kn.AbsInt(int64(end-start))+1)
for i := range res {
if end > start {
res[i] = start + i
} else {
res[i] = start - i
}
}
return res
}
// NumberFormat 以千位分隔符方式格式化一个数字.
// decimal为要保留的小数位数,point为小数点显示的字符,thousand为千位分隔符显示的字符.
// 有效数值是长度(包括小数点)为17位之内的数值,最后一位会四舍五入.
func (kn *LkkNumber) NumberFormat(number float64, decimal uint8, point, thousand string) string {
neg := false
if number < 0 {
number = -number
neg = true
}
dec := int(decimal)
// Will round off
str := fmt.Sprintf("%."+strconv.Itoa(dec)+"F", number)
prefix, suffix := "", ""
if dec > 0 {
prefix = str[:len(str)-(dec+1)]
suffix = str[len(str)-dec:]
} else {
prefix = str
}
sep := []byte(thousand)
n, l1, l2 := 0, len(prefix), len(sep)
// thousands sep num
c := (l1 - 1) / 3
tmp := make([]byte, l2*c+l1)
pos := len(tmp) - 1
for i := l1 - 1; i >= 0; i, n, pos = i-1, n+1, pos-1 {
if l2 > 0 && n > 0 && n%3 == 0 {
for j := range sep {
tmp[pos] = sep[l2-j-1]
pos--
}
}
tmp[pos] = prefix[i]
}
s := string(tmp)
if dec > 0 {
s += point + suffix
}
if neg {
s = "-" + s
}
return s
}
// FloatEqual 比较两个浮点数是否相等.decimal为小数精确位数,默认为 FLOAT_DECIMAL .
// 有效数值是长度(包括小数点)为17位之内的数值,最后一位会四舍五入.
func (kn *LkkNumber) FloatEqual(f1 float64, f2 float64, decimal ...uint8) (res bool) {
var threshold float64
var dec uint8
if len(decimal) == 0 {
dec = FLOAT_DECIMAL
} else {
dec = decimal[0]
}
//比较精度
threshold = math.Pow10(-int(dec))
var diff float64
if f1 > f2 {
diff = f1 - f2
} else {
diff = f2 - f1
}
//diff := math.Abs(f1 - f2)
res = diff <= threshold
return
}
// RandInt64 生成一个min~max范围内的随机int64整数.
func (kn *LkkNumber) RandInt64(min, max int64) int64 {
if min > max {
min, max = max, min
} else if min == max {
return min
}
//范围是否在边界内
mMax := int64(math.MaxInt32)
mMin := int64(math.MinInt32)
inrang := (mMin <= min && max <= mMax) || (INT64_MIN <= min && max <= 0) || (0 <= min && max <= INT64_MAX)
if !inrang {
min, max = mMin, mMax
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
return r.Int63n(max-min) + min
}
// RandInt 生成一个min~max范围内的随机int整数.
func (kn *LkkNumber) RandInt(min, max int) int {
if min > max {
min, max = max, min
} else if min == max {
return min
}
//范围是否在边界内
mMax := int(math.MaxInt32)
mMin := math.MinInt32
inrang := (mMin <= min && max <= mMax) || (INT_MIN <= min && max <= 0) || (0 <= min && max <= INT_MAX)
if !inrang {
min, max = mMin, mMax
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
return r.Intn(max-min) + min
}
// Rand RandInt的别名.
func (kn *LkkNumber) Rand(min, max int) int {
return kn.RandInt(min, max)
}
// RandFloat64 生成一个min~max范围内的随机float64浮点数.
func (kn *LkkNumber) RandFloat64(min, max float64) float64 {
if min > max {
min, max = max, min
}
//范围是否在边界内
mMax := math.MaxFloat32
mMin := -mMax
inrang := (mMin <= min && max <= mMax) || (-math.MaxFloat64 <= min && max <= 0) || (0 <= min && max <= math.MaxFloat64)
if !inrang {
min, max = mMin, mMax
}
r := rand.New(rand.NewSource(time.Now().UnixNano()))
num := r.Float64()
res := min + num*(max-min)
return res
}
// Round 对浮点数(的整数)进行四舍五入.
func (kn *LkkNumber) Round(value float64) float64 {
return math.Floor(value + 0.5)
}
// RoundPlus 对指定的小数位进行四舍五入.
// precision为小数位数.
func (kn *LkkNumber) RoundPlus(value float64, precision uint8) float64 {
shift := math.Pow(10, float64(precision))
return kn.Round(value*shift) / shift
}
// Floor 向下取整.
func (kn *LkkNumber) Floor(value float64) float64 {
return math.Floor(value)
}
// Ceil 向上取整.
func (kn *LkkNumber) Ceil(value float64) float64 {
return math.Ceil(value)
}
// MaxInt int整数序列求最大值.
func (kn *LkkNumber) MaxInt(nums ...int) (res int) {
if len(nums) < 1 {
panic("[MaxInt]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
if v > res {
res = v
}
}
return
}
// MaxInt64 int64整数序列求最大值.
func (kn *LkkNumber) MaxInt64(nums ...int64) (res int64) {
if len(nums) < 1 {
panic("[MaxInt64]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
if v > res {
res = v
}
}
return
}
// MaxFloat32 32位浮点数序列求最大值.
func (kn *LkkNumber) MaxFloat32(nums ...float32) (res float32) {
if len(nums) < 1 {
panic("[MaxFloat32]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
if v > res {
res = v
}
}
return
}
// MaxFloat64 64位浮点数序列求最大值.
func (kn *LkkNumber) MaxFloat64(nums ...float64) (res float64) {
if len(nums) < 1 {
panic("[MaxFloat64]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
res = math.Max(res, v)
}
return
}
// Max 取出任意类型中数值类型的最大值,无数值类型则为0.
func (kn *LkkNumber) Max(nums ...interface{}) (res float64) {
if len(nums) < 1 {
panic("[Max]` nums length is less than 1")
}
var err error
var val float64
res, _ = numeric2Float(nums[0])
for _, v := range nums {
val, err = numeric2Float(v)
if err == nil {
res = math.Max(res, val)
}
}
return
}
// MinInt int整数序列求最小值.
func (kn *LkkNumber) MinInt(nums ...int) (res int) {
if len(nums) < 1 {
panic("[MinInt]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
if v < res {
res = v
}
}
return
}
// MinInt64 int64整数序列求最小值.
func (kn *LkkNumber) MinInt64(nums ...int64) (res int64) {
if len(nums) < 1 {
panic("[MinInt64]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
if v < res {
res = v
}
}
return
}
// MinFloat32 32位浮点数序列求最小值.
func (kn *LkkNumber) MinFloat32(nums ...float32) (res float32) {
if len(nums) < 1 {
panic("[MinFloat32]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
if v < res {
res = v
}
}
return
}
// MinFloat64 64位浮点数序列求最小值.
func (kn *LkkNumber) MinFloat64(nums ...float64) (res float64) {
if len(nums) < 1 {
panic("[MinFloat64]` nums length is less than 1")
}
res = nums[0]
for _, v := range nums {
res = math.Min(res, v)
}
return
}
// Min 取出任意类型中数值类型的最小值,无数值类型则为0.
func (kn *LkkNumber) Min(nums ...interface{}) (res float64) {
if len(nums) < 1 {
panic("[Min]` nums length is less than 1")
}
var err error
var val float64
res, _ = numeric2Float(nums[0])
for _, v := range nums {
val, err = numeric2Float(v)
if err == nil {
res = math.Min(res, val)
}
}
return
}
// Exp 计算 e 的指数.
func (kn *LkkNumber) Exp(x float64) float64 {
return math.Exp(x)
}
// Expm1 返回 exp(x) - 1.
func (kn *LkkNumber) Expm1(x float64) float64 {
return math.Exp(x) - 1
}
// Pow 指数表达式,求x的y次方.
func (kn *LkkNumber) Pow(x, y float64) float64 {
return math.Pow(x, y)
}
// Log 对数表达式,求以y为底x的对数.
func (kn *LkkNumber) Log(x, y float64) float64 {
return math.Log(x) / math.Log(y)
}
// ByteFormat 格式化文件比特大小.
// size为文件大小,decimal为要保留的小数位数,delimiter为数字和单位间的分隔符.
func (kn *LkkNumber) ByteFormat(size float64, decimal uint8, delimiter string) string {
var arr = []string{"B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB", Unknown}
var pos int = 0
var j float64 = size
for {
if size >= 1024 {
size = size / 1024
j = j / 1024
pos++
} else {
break
}
}
if pos >= len(arr) { // fixed out index bug
pos = len(arr) - 1
}
return fmt.Sprintf("%."+strconv.Itoa(int(decimal))+"f%s%s", j, delimiter, arr[pos])
}
// IsOdd 变量是否奇数.
func (kn *LkkNumber) IsOdd(val int) bool {
return val%2 != 0
}
// IsEven 变量是否偶数.
func (kn *LkkNumber) IsEven(val int) bool {
return val%2 == 0
}
// NumSign 返回数值的符号.值>0为1,<0为-1,其他为0.
func (kn *LkkNumber) NumSign(value float64) (res int8) {
if value > 0 {
res = 1
} else if value < 0 {
res = -1
} else {
res = 0
}
return
}
// IsNegative 数值是否为负数.
func (kn *LkkNumber) IsNegative(value float64) bool {
return value < 0
}
// IsPositive 数值是否为正数.
func (kn *LkkNumber) IsPositive(value float64) bool {
return value > 0
}
// IsNonNegative 数值是否为非负数.
func (kn *LkkNumber) IsNonNegative(value float64) bool {
return value >= 0
}
// IsNonPositive 数值是否为非正数.
func (kn *LkkNumber) IsNonPositive(value float64) bool {
return value <= 0
}
// IsWhole 数值是否为整数.
func (kn *LkkNumber) IsWhole(value float64) bool {
return math.Remainder(value, 1) == 0
}
// IsNatural 数值是否为自然数(包括0).
func (kn *LkkNumber) IsNatural(value float64) bool {
return kn.IsNonNegative(value) && kn.IsWhole(value)
}
// InRangeInt 数值是否在2个整数范围内.
func (kn *LkkNumber) InRangeInt(value, left, right int) bool {
if left > right {
left, right = right, left
}
return value >= left && value <= right
}
// InRangeFloat64 数值是否在2个64位浮点数范围内.
func (kn *LkkNumber) InRangeFloat64(value, left, right float64) bool {
if left > right {
left, right = right, left
}
return value >= left && value <= right
}
// InRangeFloat32 数值是否在2个32位浮点数范围内.
func (kn *LkkNumber) InRangeFloat32(value, left, right float32) bool {
if left > right {
left, right = right, left
}
return value >= left && value <= right
}
// InRange 数值是否在某个范围内,将自动转换类型再比较.
func (kn *LkkNumber) InRange(value interface{}, left interface{}, right interface{}) bool {
reflectValue := reflect.TypeOf(value).Kind()
reflectLeft := reflect.TypeOf(left).Kind()
reflectRight := reflect.TypeOf(right).Kind()
if reflectValue == reflect.Int && reflectLeft == reflect.Int && reflectRight == reflect.Int {
return kn.InRangeInt(value.(int), left.(int), right.(int))
} else if reflectValue == reflect.Float32 && reflectLeft == reflect.Float32 && reflectRight == reflect.Float32 {
return kn.InRangeFloat32(value.(float32), left.(float32), right.(float32))
} else if reflectValue == reflect.Float64 && reflectLeft == reflect.Float64 && reflectRight == reflect.Float64 {
return kn.InRangeFloat64(value.(float64), left.(float64), right.(float64))
} else if KConv.IsInt(value) && KConv.IsInt(left) && KConv.IsInt(right) {
return kn.InRangeInt(KConv.ToInt(value), KConv.ToInt(left), KConv.ToInt(right))
} else if KConv.IsNumeric(value) && KConv.IsNumeric(left) && KConv.IsNumeric(right) {
return kn.InRangeFloat64(KConv.ToFloat(value), KConv.ToFloat(left), KConv.ToFloat(right))
}
return false
}
// SumInt int整数求和.
func (kn *LkkNumber) SumInt(nums ...int) int {
var sum int
for _, v := range nums {
sum += v
}
return sum
}
// SumInt64 int64整数求和.
func (kn *LkkNumber) SumInt64(nums ...int64) int64 {
var sum int64
for _, v := range nums {
sum += v
}
return sum
}
// SumFloat32 32位浮点数求和.
func (kn *LkkNumber) SumFloat32(nums ...float32) float32 {
var sum float32
for _, v := range nums {
sum += v
}
return sum
}
// SumFloat64 64位浮点数求和.
func (kn *LkkNumber) SumFloat64(nums ...float64) float64 {
var sum float64
for _, v := range nums {
sum += v
}
return sum
}
// Sum 对任意类型序列中的数值类型求和,忽略非数值的.
func (kn *LkkNumber) Sum(nums ...interface{}) (res float64) {
var err error
var val float64
for _, v := range nums {
val, err = numeric2Float(v)
if err == nil {
res += val
}
}
return
}
// AverageInt 对int整数序列求平均值.
func (kn *LkkNumber) AverageInt(nums ...int) (res float64) {
length := len(nums)
if length == 0 {
return
} else if length == 1 {
res = float64(nums[0])
} else {
total := kn.SumInt(nums...)
res = float64(total) / float64(length)
}
return
}
// AverageInt64 对int64整数序列求平均值.
func (kn *LkkNumber) AverageInt64(nums ...int64) (res float64) {
length := len(nums)
if length == 0 {
return
} else if length == 1 {
res = float64(nums[0])
} else {
total := kn.SumInt64(nums...)
res = float64(total) / float64(length)
}
return
}
// AverageFloat32 对32位浮点数序列求平均值.
func (kn *LkkNumber) AverageFloat32(nums ...float32) (res float32) {
length := len(nums)
if length == 0 {
return
} else if length == 1 {
res = nums[0]
} else {
total := kn.SumFloat32(nums...)
res = total / float32(length)
}
return
}
// AverageFloat64 对64位浮点数序列求平均值.
func (kn *LkkNumber) AverageFloat64(nums ...float64) (res float64) {
length := len(nums)
if length == 0 {
return
} else if length == 1 {
res = nums[0]
} else {
total := kn.SumFloat64(nums...)
res = total / float64(length)
}
return
}
// Average 对任意类型序列中的数值类型求平均值,忽略非数值的.
func (kn *LkkNumber) Average(nums ...interface{}) (res float64) {
length := len(nums)
if length == 0 {
return
} else if length == 1 {
res, _ = numeric2Float(nums[0])
} else {
var count int
var err error
var val, total float64
for _, v := range nums {
val, err = numeric2Float(v)
if err == nil {
count++
total += val
}
}
res = total / float64(count)
}
return
}
// Percent 返回百分比((val/total) *100).
func (kn *LkkNumber) Percent(val, total interface{}) float64 {
t := toFloat(total)
if t == 0 {
return float64(0)
}
v := toFloat(val)
return (v / t) * 100
}
// IsNan 是否为“非数值”.注意,这里复数也算“非数值”.
func (kn *LkkNumber) IsNan(val interface{}) bool {
if isFloat(val) {
return math.IsNaN(KConv.ToFloat(val))
}
return !isNumeric(val)
}
// IsNaturalRange 是否连续的自然数数组/切片,如[0,1,2,3...],其中不能有间断.
// strict为是否严格检查元素的顺序.
func (kn *LkkNumber) IsNaturalRange(arr []int, strict bool) (res bool) {
n := len(arr)
if n == 0 {
return
}
orig := kn.Range(0, n-1)
ctyp := COMPARE_ONLY_VALUE
if strict {
ctyp = COMPARE_BOTH_KEYVALUE
}
diff := KArr.ArrayDiff(orig, arr, ctyp)
res = len(diff) == 0
return
}
// GeoDistance 获取地理距离/米.
// 参数分别为两点的经度和纬度:lat:-90~90,lng:-180~180.
func (kn *LkkNumber) GeoDistance(lng1, lat1, lng2, lat2 float64) float64 {
//地球半径
radius := 6371000.0
rad := math.Pi / 180.0
lng1 = lng1 * rad
lat1 = lat1 * rad
lng2 = lng2 * rad
lat2 = lat2 * rad
theta := lng2 - lng1
dist := math.Acos(math.Sin(lat1)*math.Sin(lat2) + math.Cos(lat1)*math.Cos(lat2)*math.Cos(theta))
return dist * radius
}
// NearLogarithm 求以 base 为底 num 的对数临近值.
// num为自然数,base为正整数,left是否向左取整.
func (kn *LkkNumber) NearLogarithm(num, base int, left bool) int {
if num < 0 {
panic("[nearLogarithm]` num must be non-negative")
} else if base <= 0 {
panic("[nearLogarithm]` base must be a positive integer")
}
res := kn.Log(float64(num), float64(base))
if left {
return int(kn.Floor(res))
}
return int(kn.Ceil(res))
}
// SplitNaturalNum 将自然数 num 按底数 base 进行拆解;所得结果的列表累计和为num.
func (kn *LkkNumber) SplitNaturalNum(num, base int) []int {
var res []int
if !kn.IsNatural(toFloat(num)) {
panic("[splitNaturalNum]` num must be a natural number")
} else if base <= 0 {
panic("[splitNaturalNum]` base must be a positive integer")
}
var n, child int
for num > base {
n = kn.NearLogarithm(num, base, true)
child = int(math.Pow(float64(base), float64(n)))
num -= child
res = append(res, child)
}
if (num > 0) || (num == 0 && len(res) == 0) {
res = append(res, num)
}
return res
}