package rand
Import Path
math/rand (on golang.org and go.dev)
Dependency Relation
imports 2 packages, and imported by 3 packages
Involved Source Files
exp.go
normal.go
d-> rand.go
rng.go
zipf.go
Exported Type Names
Exported Values
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()
float32
Float32 returns, as a float32, a pseudo-random number in [0.0,1.0)
from the default Source.
func
Float64()
float64
Float64 returns, as a float64, a pseudo-random number in [0.0,1.0)
from the default Source.
func
Int()
int
Int returns a non-negative pseudo-random int from the default Source.
func
Int31()
int32
Int31 returns a non-negative pseudo-random 31-bit integer as an int32
from the default Source.
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()
int64
Int63 returns a non-negative pseudo-random 63-bit integer as an int64
from the default Source.
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(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
New(src
Source) *
Rand
New returns a new Rand that uses random values from src
to generate other random values.
func
NewSource(seed
int64)
Source
NewSource returns a new pseudo-random Source seeded with the given value.
Unlike the default Source used by top-level functions, this source is not
safe for concurrent use by multiple goroutines.
func
NewZipf(r *
Rand, s
float64, v
float64, imax
uint64) *
Zipf
NewZipf returns a Zipf variate generator.
The generator generates values k ∈ [0, imax]
such that P(k) is proportional to (v + k) ** (-s).
Requirements: s > 1 and v >= 1.
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(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(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(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 2³¹-1 generate the same pseudo-random sequence.
Seed, unlike the Rand.Seed method, is safe for concurrent use.
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()
uint32
Uint32 returns a pseudo-random 32-bit value as a uint32
from the default Source.
func
Uint64()
uint64
Uint64 returns a pseudo-random 64-bit value as a uint64
from the default Source.
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