Documentation
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Overview ¶
Package rand provide a fast pseudo-random number generator
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 NewRand(seed int64) *rand.Rand
- func NewSource(seed int64) rand.Source64
- 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 Source
Constants ¶
This section is empty.
Variables ¶
This section is empty.
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). 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 the half-open interval [0.0,1.0).
func Float64 ¶
func Float64() float64
Float64 returns, as a float64, a pseudo-random number in the half-open interval [0.0,1.0).
func Int31 ¶
func Int31() int32
Int31 returns a non-negative pseudo-random 31-bit integer as an int32.
func Int31n ¶
Int31n returns, as an int32, a non-negative pseudo-random number in the half-open interval [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 ¶
Int63n returns, as an int64, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n <= 0.
func Intn ¶
Intn returns, as an int, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n <= 0.
func NewSource ¶
NewSource return a rand.Source64 base on seed
func NormFloat64 ¶
func NormFloat64() float64
NormFloat64 returns a normally distributed float64 in the range -math.MaxFloat64 through +math.MaxFloat64 inclusive, 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 ¶
Perm returns, as a slice of n ints, a pseudo-random permutation of the integers in the half-open interval [0,n).
func Read ¶
Read generates len(p) random bytes and writes them into p. It always returns len(p) and a nil error. Read should not be called concurrently with any other Rand method.
func Seed ¶
func Seed(seed int64)
Seed uses the provided seed value to initialize the generator to a deterministic state. Seed should not be called concurrently with any other Rand method.
func Shuffle ¶
Shuffle pseudo-randomizes the order of elements. n is the number of elements. Shuffle panics if n < 0. swap swaps the elements with indexes i and j.
Source Files