unaryFactory

Create a factory function for generating pseudorandom values drawn from a unary PRNG.

Installation

npm install @stdlib/random-array-tools-unary-factory

Usage

var unaryFactory = require( '@stdlib/random-array-tools-unary-factory' );

unaryFactory( prng, dtypes, dtype )

Returns a factory function for generating pseudorandom values drawn from a unary PRNG.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, 'float64' );
// returns <Function>

The function has the following parameters:

• prng: unary pseudorandom number generator.
• dtypes: list of supported output data types.
• dtype: default output array data type.

factory( [param1, ][options] )

Returns a function for generating pseudorandom values drawn from a unary PRNG.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

The function has the following parameters:

• param1: PRNG parameter. If provided a PRNG parameter, the function returns a partially applied function for creating arrays, which can be useful when wanting to pass around a parameterized function for array creation.
• options: function options.

The function supports the following options:

• prng: pseudorandom number generator which generates uniformly distributed pseudorandom numbers.
• seed: pseudorandom value generator seed.
• state: pseudorandom value generator state.
• copy: boolean indicating whether to copy a provided pseudorandom value generator state.
• dtype: default output array data type. Setting this option overrides the default output array data type provided to the parent function.

Full Arity

random( len, param1[, options] )

Returns an array of pseudorandom values drawn from a unary PRNG.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var v = random( 10, 2.0 );
// returns <Float64Array>

The function has the following parameters:

• len: output array length.
• param1: PRNG parameter.
• options: function options.

The function accepts the following options:

• dtype: output array data type. Setting this option overrides the default output array data type.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var v = random( 10, 2.0, {
    'dtype': 'float32'
});
// returns <Float32Array>

random.assign( param1, out )

Fills an array with pseudorandom values drawn from a unary PRNG.

var exponential = require( '@stdlib/random-base-exponential' );
var zeros = require( '@stdlib/array-zeros' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var out = zeros( 10, 'float64' );
// returns <Float64Array>

var v = random.assign( 2.0, out );
// returns <Float64Array>

var bool = ( out === v );
// returns true

The method has the following parameters:

• param1: PRNG parameter.
• out: output array.

Partial Application

random( len[, options] )

Returns an array of pseudorandom values drawn from a unary PRNG.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory( 2.0 );
// returns <Function>

var v = random( 10 );
// returns <Float64Array>

v = random( 10 );
// returns <Float64Array>

The function has the following parameters:

• len: output array length.
• options: function options.

The function accepts the following options:

• dtype: output array data type. Setting this option overrides the default output array data type.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory( 2.0 );
// returns <Function>

var v = random( 10, {
    'dtype': 'float32'
});
// returns <Float32Array>

v = random( 10, {
    'dtype': 'generic'
});
// returns [...]

random.assign( out )

Fills an array with pseudorandom values drawn from a unary PRNG.

var exponential = require( '@stdlib/random-base-exponential' );
var zeros = require( '@stdlib/array-zeros' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory( 2.0 );
// returns <Function>

var out = zeros( 10, 'float64' );
// returns <Float64Array>

var v = random.assign( out );
// returns <Float64Array>

var bool = ( out === v );
// returns true

The method has the following parameters:

• out: output array.

random.PRNG

The underlying pseudorandom number generator.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var prng = random.PRNG;
// returns <Function>

random.seed

The value used to seed the underlying pseudorandom number generator.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var seed = random.seed;
// returns <Uint32Array>

If the factory function is provided a PRNG for uniformly distributed numbers, the associated property value on the returned function is null.

var minstd = require( '@stdlib/random-base-minstd-shuffle' ).normalized;
var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory({
    'prng': minstd
});
// returns <Function>

var seed = random.seed;
// returns null

random.seedLength

Length of underlying pseudorandom number generator seed.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var len = random.seedLength;
// returns <number>

If the factory function is provided a PRNG for uniformly distributed numbers, the associated property value on the returned function is null.

var minstd = require( '@stdlib/random-base-minstd-shuffle' ).normalized;
var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory({
    'prng': minstd
});
// returns <Function>

var len = random.seedLength;
// returns null

random.state

Writable property for getting and setting the underlying pseudorandom number generator state.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var state = random.state;
// returns <Uint32Array>

If the factory function is provided a PRNG for uniformly distributed numbers, the associated property value on the returned function is null.

var minstd = require( '@stdlib/random-base-minstd-shuffle' ).normalized;
var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory({
    'prng': minstd
});
// returns <Function>

var state = random.state;
// returns null

random.stateLength

Length of underlying pseudorandom number generator state.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var len = random.stateLength;
// returns <number>

If the factory function is provided a PRNG for uniformly distributed numbers, the associated property value on the returned function is null.

var minstd = require( '@stdlib/random-base-minstd-shuffle' ).normalized;
var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory({
    'prng': minstd
});
// returns <Function>

var len = random.stateLength;
// returns null

random.byteLength

Size (in bytes) of underlying pseudorandom number generator state.

var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory();
// returns <Function>

var sz = random.byteLength;
// returns <number>

If the factory function is provided a PRNG for uniformly distributed numbers, the associated property value on the returned function is null.

var minstd = require( '@stdlib/random-base-minstd-shuffle' ).normalized;
var exponential = require( '@stdlib/random-base-exponential' );

var dtypes = [ 'float64', 'float32', 'generic' ];

var factory = unaryFactory( exponential, dtypes, dtypes[ 0 ] );
// returns <Function>

var random = factory({
    'prng': minstd
});
// returns <Function>

var sz = random.byteLength;
// returns null

Examples

var exponential = require( '@stdlib/random-base-exponential' );
var dtypes = require( '@stdlib/array-dtypes' );
var unaryFactory = require( '@stdlib/random-array-tools-unary-factory' );

var dt = dtypes( 'real_floating_point_and_generic' );

var factory = unaryFactory( exponential, dt, 'float64' );
// returns <Function>

var random = factory();
// returns <Function>

var x = random( 10, 2.0 );
// returns <Float64Array>

x = random( 10, 2.0, {
    'dtype': 'float32'
});
// returns <Float32Array>

x = random( 10, 2.0, {
    'dtype': 'generic'
});
// returns [...]

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.