@stdlib/random-strided-tools-ternary-factory

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ternaryFactory

Create a factory function for filling strided arrays with pseudorandom values drawn from a ternary PRNG.

Installation

npm install @stdlib/random-strided-tools-ternary-factory

Usage

var ternaryFactory = require( '@stdlib/random-strided-tools-ternary-factory' );

ternaryFactory( prng )

Returns a factory function for filling strided arrays with pseudorandom values drawn from a ternary PRNG.

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

var factory = ternaryFactory( triangular );
// returns <Function>

The function has the following parameters:

• prng: ternary pseudorandom number generator.

---

factory( [options] )

Returns a function for filling strided arrays with pseudorandom values drawn from a ternary PRNG.

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

var factory = ternaryFactory( triangular );
// returns <Function>

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

The function has the following parameters:

• 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.

To use a custom PRNG as the underlying source of uniformly distributed pseudorandom numbers, set the prng option.

var Float64Array = require( '@stdlib/array-float64' );
var minstd = require( '@stdlib/random-base-minstd' );
var triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// returns <Function>

var opts = {
    'prng': minstd.normalized
};

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

var out = new Float64Array( 10 );
random( out.length, [ 2.0 ], 0, [ 5.0 ], 0, [ 3.0 ], 0, out, 1 );

To seed the underlying pseudorandom number generator, set the seed option.

var Float64Array = require( '@stdlib/array-float64' );
var triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// returns <Function>

var opts = {
    'seed': 12345
};

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

var out = new Float64Array( 10 );
random( out.length, [ 2.0 ], 0, [ 5.0 ], 0, [ 3.0 ], 0, out, 1 );

---

random( N, param1, sp1, param2, sp2, param3, sp3, out, so )

Fills a strided array with pseudorandom values drawn from a ternary PRNG.

var Float64Array = require( '@stdlib/array-float64' );
var triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// returns <Function>

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

var out = new Float64Array( 10 );
// returns <Float64Array>

var v = random( out.length, [ 2.0 ], 0, [ 5.0 ], 0, [ 3.0 ], 0, out, 1 );
// returns <Float64Array>

The function has the following parameters:

• N: number of indexed elements.
• param1: first PRNG parameter.
• sp1: index increment for param1.
• param2: second PRNG parameter.
• sp2: index increment for param2.
• param3: third PRNG parameter.
• sp3: index increment for param3.
• out: output array.
• so: index increment for out.

The N and stride parameters determine which strided array elements are accessed at runtime. For example, to access every other value in out,

var Float64Array = require( '@stdlib/array-float64' );
var triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// returns <Function>

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

var out = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];

random( 3, [ 2.0 ], 0, [ 5.0 ], 0, [ 3.0 ], 0, out, 2 );

Note that indexing is relative to the first index. To introduce an offset, use typed array views.

var Float64Array = require( '@stdlib/array-float64' );
var triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// returns <Function>

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

// Initial arrays:
var param1 = new Float64Array( [ 2.0, 2.0, 2.0, 2.0, 2.0, 2.0 ] );
var param2 = new Float64Array( [ 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 ] );
var param3 = new Float64Array( [ 3.0, 3.0, 3.0, 3.0, 3.0, 3.0 ] );

// Create offset views:
var view1 = new Float64Array( param1.buffer, param1.BYTES_PER_ELEMENT*3 ); // start at 4th element
var view2 = new Float64Array( param2.buffer, param2.BYTES_PER_ELEMENT*2 ); // start at 3rd element
var view3 = new Float64Array( param3.buffer, param3.BYTES_PER_ELEMENT*1 ); // start at 2nd element

// Create an output array:
var out = new Float64Array( 3 );

// Fill the output array:
random( out.length, view1, -1, view2, 1, view3, 1, out, 1 );

random.ndarray( N, param1, sp1, op1, param2, sp2, op2, param3, sp3, op3, out, so, oo )

Fills a strided array with pseudorandom values drawn from a ternary PRNG using alternative indexing semantics.

var Float64Array = require( '@stdlib/array-float64' );
var triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// returns <Function>

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

var out = new Float64Array( 10 );
// returns <Float64Array>

var v = random.ndarray( out.length, [ 2.0 ], 0, 0, [ 5.0 ], 0, 0, [ 3.0 ], 0, 0, out, 1, 0 );
// returns <Float64Array>

The function has the following additional parameters:

• op1: starting index for param1.
• op2: starting index for param2.
• op3: starting index for param3.
• oo: starting index for out.

While typed array views mandate a view offset based on the underlying buffer, the offset parameters support indexing semantics based on starting indices. For example, to access every other value in out starting from the second value,

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

var factory = ternaryFactory( triangular );
// returns <Function>

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

var out = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];

random.ndarray( 3, [ 2.0 ], 0, 0, [ 5.0 ], 0, 0, [ 3.0 ], 0, 0, out, 2, 1 );

---

random.PRNG

The underlying pseudorandom number generator.

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

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// 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 triangular = require( '@stdlib/random-base-triangular' );

var factory = ternaryFactory( triangular );
// returns <Function>

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

var sz = random.byteLength;
// returns null

---

Examples

var triangular = require( '@stdlib/random-base-triangular' );
var zeros = require( '@stdlib/array-zeros' );
var zeroTo = require( '@stdlib/array-zero-to' );
var logEach = require( '@stdlib/console-log-each' );
var ternaryFactory = require( '@stdlib/random-strided-tools-ternary-factory' );

// Create a PRNG factory function:
var factory = ternaryFactory( triangular );
// returns <Function>

// Specify a PRNG seed:
var opts = {
    'seed': 1234
};

// Create a function for filling strided arrays:
var rand1 = factory( opts );
// returns <Function>

// Create an array:
var x1 = zeros( 10, 'float64' );

// Fill the array with pseudorandom numbers:
rand1( x1.length, [ 2.0 ], 0, [ 5.0 ], 0, [ 3.0 ], 0, x1, 1 );

// Create another function for filling strided arrays:
var rand2 = factory( opts );
// returns <Function>

// Create a second array:
var x2 = zeros( 10, 'generic' );

// Fill the array with the same pseudorandom numbers:
rand2( x2.length, [ 2.0 ], 0, [ 5.0 ], 0, [ 3.0 ], 0, x2, 1 );

// Create a list of indices:
var idx = zeroTo( x1.length, 'generic' );

// Print the array contents:
logEach( 'x1[%d] = %.2f; x2[%d] = %.2f', idx, x1, idx, x2 );

---

Notice

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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

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License

See LICENSE.

Copyright

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