random

Documentation

Index

• Constants
• func ExpFloat64() float64
• func Float32() float32
• func Float64() float64
• func GetRandomNumber(args string, n int) []int
• func GetRandomNumbers(args string) []int
• func GetRandomValues(numbers []int, n int) []int
• func GetRandomValuesInt64(numbers []int64, n int) []int64
• func GetRandomWeight(data RandInterface, n int) interface{}
• func GlobalRand() *rand.Rand
• func Int() int
• func Int31() int32
• func Int31n(n int32) int32
• func Int63() int64
• func Int63n(n int64) int64
• func Intn(n int) int
• func NormFloat64() float64
• func Perm(n int) []int
• func Read(p []byte) (n int, err error)
• func Seed(seed int64)
• func Shuffle(n int, swap func(i, j int))
• func Uint32() uint32
• func Uint64() uint64
• type LCGRand
  • func NewLCGRand(seed uint32) *LCGRand
  • func (lcg *LCGRand) NextRand() uint32
  • func (lcg *LCGRand) RandFloat64() float64
  • func (lcg *LCGRand) RandN(n uint32) uint32
• type RandInterface
• type RandItem
  • func GetRandomItems(items []RandItem, n int) []RandItem

Constants

const (
	LCG_A uint32 = 1664525
	LCG_C uint32 = 1013904223
)

Functions

func ExpFloat64

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

func Float32() float32

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

func Float64

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

func GlobalRand() *rand.Rand

func Int

func Int() int

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

func Int31

func Int31() int32

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

func Int31n

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

func Int63() int64

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

func Int63n

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

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

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

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

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

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

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

func Uint32() uint32

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

func Uint64

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