rand - The Go Programming Language

Golang

Package rand

import "math/rand"
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Package rand implements pseudo-random number generators.

Index

func ExpFloat64() float64
func Float32() float32
func Float64() float64
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 Seed(seed int64)
func Uint32() uint32
type Rand
    func New(src Source) *Rand
    func (r *Rand) ExpFloat64() float64
    func (r *Rand) Float32() float32
    func (r *Rand) Float64() float64
    func (r *Rand) Int() int
    func (r *Rand) Int31() int32
    func (r *Rand) Int31n(n int32) int32
    func (r *Rand) Int63() int64
    func (r *Rand) Int63n(n int64) int64
    func (r *Rand) Intn(n int) int
    func (r *Rand) NormFloat64() float64
    func (r *Rand) Perm(n int) []int
    func (r *Rand) Seed(seed int64)
    func (r *Rand) Uint32() uint32
type Source
    func NewSource(seed int64) Source
type Zipf
    func NewZipf(r *Rand, s float64, v float64, imax uint64) *Zipf
    func (z *Zipf) Uint64() uint64

Package files

exp.go normal.go rand.go rng.go zipf.go

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). 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).

func Float64

func Float64() float64

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

func Int

func Int() int

Int returns a non-negative pseudo-random int.

func Int31

func Int31() int32

Int31 returns a non-negative pseudo-random 31-bit integer as an int32.

func Int31n

func Int31n(n int32) int32

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

func Int63

func Int63() int64

Int63 returns a non-negative pseudo-random 63-bit integer as an int64.

func Int63n

func Int63n(n int64) int64

Int63n returns, as an int64, a non-negative pseudo-random number in [0,n). 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). 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). 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).

func Seed

func Seed(seed int64)

Seed uses the provided seed value to initialize the generator to a deterministic state. If Seed is not called, the generator behaves as if seeded by Seed(1).

func Uint32

func Uint32() uint32

Uint32 returns a pseudo-random 32-bit value as a uint32.

type Rand

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

A Rand is a source of random numbers.

func New

func New(src Source) *Rand

New returns a new Rand that uses random values from src to generate other random values.

func (*Rand) ExpFloat64

func (r *Rand) 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). To produce a distribution with a different rate parameter, callers can adjust the output using:

sample = ExpFloat64() / desiredRateParameter

func (*Rand) Float32

func (r *Rand) Float32() float32

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

func (*Rand) Float64

func (r *Rand) Float64() float64

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

func (*Rand) Int

func (r *Rand) Int() int

Int returns a non-negative pseudo-random int.

func (*Rand) Int31

func (r *Rand) Int31() int32

Int31 returns a non-negative pseudo-random 31-bit integer as an int32.

func (*Rand) Int31n

func (r *Rand) Int31n(n int32) int32

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

func (*Rand) Int63

func (r *Rand) Int63() int64

Int63 returns a non-negative pseudo-random 63-bit integer as an int64.

func (*Rand) Int63n

func (r *Rand) Int63n(n int64) int64

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

func (*Rand) Intn

func (r *Rand) Intn(n int) int

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

func (*Rand) NormFloat64

func (r *Rand) NormFloat64() float64

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

sample = NormFloat64() * desiredStdDev + desiredMean

func (*Rand) Perm

func (r *Rand) Perm(n int) []int

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

func (*Rand) Seed

func (r *Rand) Seed(seed int64)

Seed uses the provided seed value to initialize the generator to a deterministic state.

func (*Rand) Uint32

func (r *Rand) Uint32() uint32

Uint32 returns a pseudo-random 32-bit value as a uint32.

type Source

type Source interface {
    Int63() int64
    Seed(seed int64)
}

A Source represents a source of uniformly-distributed pseudo-random int64 values in the range [0, 1<<63).

func NewSource

func NewSource(seed int64) Source

NewSource returns a new pseudo-random Source seeded with the given value.

type Zipf

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

A Zipf generates Zipf distributed variates.

func NewZipf

func NewZipf(r *Rand, s float64, v float64, imax uint64) *Zipf

NewZipf returns a Zipf generating variates p(k) on [0, imax] proportional to (v+k)**(-s) where s>1 and k>=0, and v>=1.

func (*Zipf) Uint64

func (z *Zipf) Uint64() uint64

Uint64 returns a value drawn from the Zipf distributed described by the Zipf object.