random

package
v1.5.8 Latest Latest
Warning

This package is not in the latest version of its module.

Go to latest
Published: Feb 6, 2020 License: MIT Imports: 6 Imported by: 0

Documentation

Index

Constants

View Source
const (
	LCG_A uint32 = 1664525
	LCG_C uint32 = 1013904223
)

Variables

This section is empty.

Functions

func ExpFloat64 added in v1.4.15

func ExpFloat64() float64

ExpFloat64 returns an exponentially distributed float64 in the range (0, +math.MaxFloat64] with an exponential distribution whose rate parameter (lambda) is 1 and whose mean is 1/lambda (1) from the default Source. To produce a distribution with a different rate parameter, callers can adjust the output using:

sample = ExpFloat64() / desiredRateParameter

func Float32 added in v1.4.15

func Float32() float32

Float32 returns, as a float32, a pseudo-random number in [0.0,1.0) from the default Source.

func Float64 added in v1.4.15

func Float64() float64

Float64 returns, as a float64, a pseudo-random number in [0.0,1.0) from the default Source.

func GetRandomNumber

func GetRandomNumber(args string, n int) []int

*

  • 数值抽取器(从枚举值,范围随机值,定值 中随机抽出一个值)
  • 枚举值(支持单个出现概率):1,2,4 或 1:10,2:30,4:30
  • 范围值: 1~10
  • 定值:12
  • 支持混合使用 如:1~10,44~89,2~5 又如 2~10:40
  • 支持概率后缀 代表该值被抽取出来的几率 值越高被抽出的概率越大 并不限定后缀值的范围 如:1:20,1~4:30,4:500 *
  • @param args
  • @param n 随机个数
  • @param radom
  • @return

func GetRandomNumbers

func GetRandomNumbers(args string) []int

*

  • 加权随机数 数值抽取器 *
  • @param args 以“#”劈分数组然后再在数组元素中每一位获取一个随机数
  • @param radom
  • @see #GetRandomNumber(String, Random)
  • @return

func GetRandomValues

func GetRandomValues(numbers []int, n int) []int

*

  • 从给定的一些数值里随机抽取N个数 *
  • @param numbers,给定的等待抽取的列表
  • @param n 要随机多n个数
  • @return

func GetRandomValuesInt64

func GetRandomValuesInt64(numbers []int64, n int) []int64

*

  • 从给定的一些数值里随机抽取N个数 *
  • @param numbers,给定的等待抽取的列表
  • @param n 要随机多n个数
  • @return

func GetRandomWeight

func GetRandomWeight(data RandInterface, n int) interface{}

GetRandomWeight 随机数选取

func GlobalRand added in v1.5.5

func GlobalRand() *rand.Rand

func Int added in v1.4.15

func Int() int

Int returns a non-negative pseudo-random int from the default Source.

func Int31 added in v1.4.15

func Int31() int32

Int31 returns a non-negative pseudo-random 31-bit integer as an int32 from the default Source.

func Int31n added in v1.4.15

func Int31n(n int32) int32

Int31n returns, as an int32, a non-negative pseudo-random number in [0,n) from the default Source. It panics if n <= 0.

func Int63 added in v1.4.15

func Int63() int64

Int63 returns a non-negative pseudo-random 63-bit integer as an int64 from the default Source.

func Int63n added in v1.4.15

func Int63n(n int64) int64

Int63n returns, as an int64, a non-negative pseudo-random number in [0,n) from the default Source. It panics if n <= 0.

func Intn added in v1.4.8

func Intn(n int) int

Intn returns, as an int, a non-negative pseudo-random number in [0,n) from the default Source. It panics if n <= 0.

func NormFloat64 added in v1.4.15

func NormFloat64() float64

NormFloat64 returns a normally distributed float64 in the range [-math.MaxFloat64, +math.MaxFloat64] with standard normal distribution (mean = 0, stddev = 1) from the default Source. To produce a different normal distribution, callers can adjust the output using:

sample = NormFloat64() * desiredStdDev + desiredMean

func Perm added in v1.4.15

func Perm(n int) []int

Perm returns, as a slice of n ints, a pseudo-random permutation of the integers [0,n) from the default Source.

func Read added in v1.4.15

func Read(p []byte) (n int, err error)

Read generates len(p) random bytes from the default Source and writes them into p. It always returns len(p) and a nil error. Read, unlike the Rand.Read method, is safe for concurrent use.

func Seed added in v1.4.15

func Seed(seed int64)

Seed uses the provided seed value to initialize the default Source to a deterministic state. If Seed is not called, the generator behaves as if seeded by Seed(1). Seed values that have the same remainder when divided by 2^31-1 generate the same pseudo-random sequence. Seed, unlike the Rand.Seed method, is safe for concurrent use.

func Shuffle added in v1.4.15

func Shuffle(n int, swap func(i, j int))

Shuffle pseudo-randomizes the order of elements using the default Source. n is the number of elements. Shuffle panics if n < 0. swap swaps the elements with indexes i and j.

func Uint32 added in v1.4.15

func Uint32() uint32

Uint32 returns a pseudo-random 32-bit value as a uint32 from the default Source.

func Uint64 added in v1.4.15

func Uint64() uint64

Uint64 returns a pseudo-random 64-bit value as a uint64 from the default Source.

Types

type LCGRand

type LCGRand struct {
	// contains filtered or unexported fields
}

func NewLCGRand

func NewLCGRand(seed uint32) *LCGRand

func (*LCGRand) NextRand

func (lcg *LCGRand) NextRand() uint32

func (*LCGRand) RandFloat64

func (lcg *LCGRand) RandFloat64() float64

func (*LCGRand) RandN

func (lcg *LCGRand) RandN(n uint32) uint32

范围[0,n)

type RandInterface

type RandInterface interface {
	Len() int
	Weight(i int) int
	SubValue(indexs []int) interface{}
}

RandInterface 随机数选取器接口

type RandItem

type RandItem struct {
	ItemID  int32 `json:"itemId"`  //奖励物品ID
	Num     int32 `json:"num"`     //数量
	TimeOut int32 `json:"timeout"` //过期时间
	Weight  int32 `json:"weight"`  //权重
}

func GetRandomItems

func GetRandomItems(items []RandItem, n int) []RandItem

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL