time-to-botec/js/node_modules/@stdlib/random/base/invgamma/docs/repl.txt

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{{alias}}( α, β )
Returns a pseudorandom number drawn from an inverse gamma distribution.
If `α <= 0` or `β <= 0`, the function returns `NaN`.
If `α` or `β` is `NaN`, the function returns `NaN`.
Parameters
----------
α: number
Shape parameter.
β: number
Scale parameter.
Returns
-------
r: number
Pseudorandom number.
Examples
--------
> var r = {{alias}}( 2.0, 5.0 );
{{alias}}.factory( [α, β, ][options] )
Returns a pseudorandom number generator (PRNG) for generating pseudorandom
numbers drawn from an inverse gamma distribution.
If provided `α` and `β`, the returned PRNG returns random variates drawn
from the specified distribution.
If not provided `α` and `β`, the returned PRNG requires that both `α` and
`β` be provided at each invocation.
Parameters
----------
α: number (optional)
Shape parameter.
β: number (optional)
Scale parameter.
options: Object (optional)
Options.
options.prng: Function (optional)
Pseudorandom number generator (PRNG) for generating uniformly
distributed pseudorandom numbers on the interval `[0,1)`. If provided,
the `state` and `seed` options are ignored. In order to seed the
returned pseudorandom number generator, one must seed the provided
`prng` (assuming the provided `prng` is seedable).
options.seed: integer|ArrayLikeObject<integer> (optional)
Pseudorandom number generator seed. The seed may be either a positive
unsigned 32-bit integer or, for arbitrary length seeds, an array-like
object containing unsigned 32-bit integers.
options.state: Uint32Array (optional)
Pseudorandom number generator state. If provided, the `seed` option is
ignored.
options.copy: boolean (optional)
Boolean indicating whether to copy a provided pseudorandom number
generator state. Setting this option to `false` allows sharing state
between two or more pseudorandom number generators. Setting this option
to `true` ensures that a returned generator has exclusive control over
its internal state. Default: true.
Returns
-------
rand: Function
Pseudorandom number generator (PRNG).
Examples
--------
// Basic usage:
> var rand = {{alias}}.factory();
> var r = rand( 1.5, 1.5 );
> r = rand( 3.14, 2.25 );
// Provide `α` and `β`:
> rand = {{alias}}.factory( 1.5, 1.5 );
> r = rand();
> r = rand();
{{alias}}.NAME
Generator name.
Examples
--------
> var str = {{alias}}.NAME
'invgamma'
{{alias}}.PRNG
Underlying pseudorandom number generator.
Examples
--------
> var prng = {{alias}}.PRNG;
{{alias}}.seed
Pseudorandom number generator seed.
Examples
--------
> var seed = {{alias}}.seed;
{{alias}}.seedLength
Length of generator seed.
Examples
--------
> var len = {{alias}}.seedLength;
{{alias}}.state
Generator state.
Examples
--------
> var r = {{alias}}( 2.0, 5.0 )
<number>
> r = {{alias}}( 2.0, 5.0 )
<number>
> r = {{alias}}( 2.0, 5.0 )
<number>
// Get a copy of the current state:
> var state = {{alias}}.state
<Uint32Array>
> r = {{alias}}( 2.0, 5.0 )
<number>
> r = {{alias}}( 2.0, 5.0 )
<number>
// Set the state:
> {{alias}}.state = state;
// Replay the last two pseudorandom numbers:
> r = {{alias}}( 2.0, 5.0 )
<number>
> r = {{alias}}( 2.0, 5.0 )
<number>
{{alias}}.stateLength
Length of generator state.
Examples
--------
> var len = {{alias}}.stateLength;
{{alias}}.byteLength
Size of generator state.
Examples
--------
> var sz = {{alias}}.byteLength;
{{alias}}.toJSON()
Serializes the pseudorandom number generator as a JSON object.
Returns
-------
out: Object
JSON representation.
Examples
--------
> var o = {{alias}}.toJSON()
{ 'type': 'PRNG', 'name': '...', 'state': {...}, 'params': [] }
See Also
--------