Package rand
Overview ?
Overview ?
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.
Except as noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code is licensed under a BSD license.
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