npm package: @stdlib/random-strided-tools-ternary-factory
Description: Create a factory function for filling strided arrays with pseudorandom values drawn from a ternary PRNG.
Author: The Stdlib Authors
Latest version: 0.2.3

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# ternaryFactory

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

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
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.

```javascript
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.

```javascript
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.

```javascript
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.

```javascript
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.

```javascript
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`,

```javascript
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`][mdn-typed-array] views.

<!-- eslint-disable stdlib/capitalized-comments -->

```javascript
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.

<!-- eslint-disable max-len -->

```javascript
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`][mdn-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,

```javascript
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.

```javascript
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.

```javascript
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`.

```javascript
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.

```javascript
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`.

```javascript
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.

```javascript
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`.

```javascript
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.

```javascript
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`.

```javascript
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.

```javascript
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`.

```javascript
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
```

</section>

<!-- /.usage -->

<section class="notes">

</section>

<!-- /.notes -->

<section class="examples">

* * *

## Examples

<!-- eslint no-undef: "error" -->

```javascript
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 );
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

</section>

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* * *

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

#### Community

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---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

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