Static methods
staticbetavariate(alpha:Float, beta:Float):Float
Beta distribution. Conditions on the parameters are alpha > 0
and beta > 0
.
Returned values range between 0 and 1.
staticexpovariate(lambd:Float):Float
Exponential distribution. lambd
is 1.0 divided by the desired mean.
It should be nonzero. Returned values range from 0 to positive infinity if lambd
is positive,
and from negative infinity to 0 if lambd
is negative.
staticgammavariate(alpha:Float, beta:Float):Float
Gamma distribution. (Not the gamma function!)
Conditions on the parameters are alpha > 0
and beta > 0
.
staticgauss(mu:Float, sigma:Float):Float
Gaussian distribution. mu
is the mean, and sigma
is the standard deviation.
This is slightly faster than the normalvariate
function defined below.
staticgetrandbits(k:Int):Int
Returns a Python integer with k
random bits.
This method is supplied with the MersenneTwister
generator and
some other generators may also provide it as an optional part of the API.
When available, getrandbits
() enables randrange
() to handle arbitrarily large ranges.
staticgetstate():RandomState
Return an object capturing the current internal state of the generator. This object can be passed to setstate() to restore the state.
staticlognormvariate(mu:Float, sigma:Float):Float
Log normal distribution. If you take the natural logarithm of this distribution,
you’ll get a normal distribution with mean mu
and standard deviation sigma
.
mu
can have any value, and sigma
must be greater than zero.
staticnormalvariate(mu:Float, sigma:Float):Float
Normal distribution. mu
is the mean, and sigma
is the standard deviation.
staticrandint(a:Int, b:Int):Int
Return a random integer N such that a <= N <= b
. Alias for randrange(a, b+1)
.
staticrandrange(start:Int, stop:Int, ?step:Int):Int
staticrandrange(stop:Int):Int
Return a randomly selected element from range(start, stop, step)
.
This is equivalent to choice(range(start, stop, step))
,
but doesn’t actually build a range object.
staticseed(?a:Int, ?version:Int):Float
Initialize the random number generator.
If a
is omitted or null
, the current system time is used.
If randomness sources are provided by the operating system,
they are used instead of the system time (see the os.urandom()
function for details on availability).
If a
is an int, it is used directly.
With version
2 (the default), a str, bytes, or bytearray object
gets converted to an int and all of its bits are used.
With version 1, the hash() of a is used instead.
staticsetstate(state:RandomState):Void
state
should have been obtained from a previous call to getstate
(),
and setstate
() restores the internal state of the generator to what
it was at the time getstate
() was called.
statictriangular(?low:Float, ?high:Float, ?mode:Float):Float
Return a random floating point number N such that
low <= N <= high
and with the specified mode
between those bounds.
The low
and high
bounds default to zero and one.
The mode
argument defaults to the midpoint between the bounds,
giving a symmetric distribution.
staticuniform(a:Float, b:Float):Float
Return a random floating point number N such that
a <= N <= b
for a <= b
and b <= N <= a
for b < a
.
staticvonmisesvariate(mu:Float, kappa:Float):Float
mu
is the mean angle, expressed in radians between 0 and 2pi,
and kappa
is the concentration parameter, which must be greater than or equal to zero.
If kappa
is equal to zero, this distribution reduces to a uniform random angle
over the range 0 to 2pi.
staticweibullvariate(alpha:Float, beta:Float):Float
Weibull distribution. alpha
is the scale parameter and beta
is the shape parameter.