npm package: @stdlib/random-tools-ternary
Description: Constructor for creating ndarrays filled with pseudorandom values drawn from a ternary PRNG.
Author: The Stdlib Authors
Latest version: 0.1.1

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# Random

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> Constructor for creating ndarrays filled with pseudorandom values drawn from a ternary PRNG.

<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->

<section class="intro">

</section>

<!-- /.intro -->

<!-- Package usage documentation. -->

<section class="installation">

## Installation

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

</section>

<section class="usage">

## Usage

```javascript
var Random = require( '@stdlib/random-tools-ternary' );
```

#### Random( prng, idtypes, odtypes, policies\[, options] )

Returns an interface for creating ndarrays filled with pseudorandom values drawn from a ternary PRNG.

```javascript
var dtypes = require( '@stdlib/ndarray-dtypes' );
var frechet = require( '@stdlib/random-base-frechet' );

var idt = dtypes( 'real_and_generic' );
var odt = dtypes( 'real_floating_point_and_generic' );

var policies = {
    'output': 'real_floating_point_and_generic'
};
var options = {
    'order': 'row-major'
};

var rand = new Random( frechet, [ idt, idt, idt ], odt, policies, options );
```

The constructor has the following parameters:

-   **prng**: ternary pseudorandom value generator.

-   **idtypes**: list containing a list of supported input data types for each PRNG parameter.

-   **odtypes**: list of supported output data types.

-   **policies**: interface policies. Must have the following properties:

    -   **output**: output data type [policy][@stdlib/ndarray/policies].

-   **options**: function options (_optional_).

The constructor supports the following options:

-   **order**: default [memory layout][@stdlib/ndarray/orders].

#### Random.prototype.generate( shape, param1, param2, param3\[, options] )

Returns an ndarray filled with pseudorandom values drawn from a ternary PRNG.

```javascript
var dtypes = require( '@stdlib/ndarray-dtypes' );
var frechet = require( '@stdlib/random-base-frechet' );

var idt = dtypes( 'real_and_generic' );
var odt = dtypes( 'real_floating_point_and_generic' );

var policies = {
    'output': 'real_floating_point_and_generic'
};
var options = {
    'order': 'row-major'
};

var rand = new Random( frechet, [ idt, idt, idt ], odt, policies, options );

var v = rand.generate( [ 2, 2 ], 2.0, 3.0, 0.0 );
// returns <ndarray>
```

The method has the following parameters:

-   **shape**: output ndarray shape.
-   **param1**: first PRNG parameter. May be either a scalar or an ndarray. If an ndarray, must be [broadcast compatible][@stdlib/ndarray/base/broadcast-shapes] with the specified output ndarray shape.
-   **param2**: second PRNG parameter. May be either a scalar or an ndarray. If an ndarray, must be [broadcast compatible][@stdlib/ndarray/base/broadcast-shapes] with the specified output ndarray shape.
-   **param3**: third PRNG parameter. May be either a scalar or an ndarray. If an ndarray, must be [broadcast compatible][@stdlib/ndarray/base/broadcast-shapes] with the specified output ndarray shape.
-   **options**: function options (_optional_).

The method accepts the following options:

-   **dtype**: output ndarray data type. Setting this option overrides the output data type policy.
-   **order**: memory layout. Setting this option overrides the default memory layout.
-   **mode**: specifies how to handle indices which exceed ndarray dimensions.
-   **submode**: specifies how to handle subscripts which exceed ndarray dimensions on a per dimension basis.
-   **readonly**: boolean indicating whether an ndarray should be read-only.

By default, the method returns an ndarray having a data type determined by the output data type policy. To override the default behavior, set the `dtype` option.

```javascript
var dtypes = require( '@stdlib/ndarray-dtypes' );
var getDType = require( '@stdlib/ndarray-dtype' );
var frechet = require( '@stdlib/random-base-frechet' );

var idt = dtypes( 'real_and_generic' );
var odt = dtypes( 'real_floating_point_and_generic' );

var policies = {
    'output': 'real_floating_point_and_generic'
};
var options = {
    'order': 'row-major'
};

var rand = new Random( frechet, [ idt, idt, idt ], odt, policies, options );

var v = rand.generate( [ 2, 2 ], 2.0, 3.0, 0.0, {
    'dtype': 'generic'
});
// returns <ndarray>

var dt = String( getDType( v ) );
// returns 'generic'
```

#### Random.prototype.assign( param1, param2, param3, out )

Fills an ndarray with pseudorandom values drawn from a ternary PRNG.

```javascript
var dtypes = require( '@stdlib/ndarray-dtypes' );
var ndzeros = require( '@stdlib/ndarray-zeros' );
var frechet = require( '@stdlib/random-base-frechet' );

var idt = dtypes( 'real_and_generic' );
var odt = dtypes( 'real_floating_point_and_generic' );

var policies = {
    'output': 'real_floating_point_and_generic'
};
var options = {
    'order': 'row-major'
};

var rand = new Random( frechet, [ idt, idt, idt ], odt, policies, options );

var out = ndzeros( [ 2, 2 ] );
var v = rand.assign( 2.0, 3.0, 0.0, out );
// returns <ndarray>

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

The method has the following parameters:

-   **param1**: first PRNG parameter. May be either a scalar or an ndarray. If an ndarray, must be [broadcast compatible][@stdlib/ndarray/base/broadcast-shapes] with the output ndarray.
-   **param2**: second PRNG parameter. May be either a scalar or an ndarray. If an ndarray, must be [broadcast compatible][@stdlib/ndarray/base/broadcast-shapes] with the output ndarray.
-   **param3**: third PRNG parameter. May be either a scalar or an ndarray. If an ndarray, must be [broadcast compatible][@stdlib/ndarray/base/broadcast-shapes] with the output ndarray.
-   **out**: output ndarray.

</section>

<!-- /.usage -->

<!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->

<section class="notes">

## Notes

-   The output data type policy only applies to the `generate` method. For the `assign` method, the output ndarray is allowed to have any supported output data type.

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

```javascript
var frechet = require( '@stdlib/random-base-frechet' );
var dtypes = require( '@stdlib/ndarray-dtypes' );
var ndarray = require( '@stdlib/ndarray-ctor' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var Random = require( '@stdlib/random-tools-ternary' );

// Create a new PRNG instance...
var idt = dtypes( 'real_and_generic' );
var odt = dtypes( 'real_floating_point_and_generic' );
var policies = {
    'output': 'real_floating_point_and_generic'
};
var random = new Random( frechet, [ idt, idt, idt ], odt, policies );

// Generate a 3x3 matrix of pseudorandom numbers:
var x = random.generate( [ 3, 3 ], 2.0, 3.0, 0.0 );
console.log( ndarray2array( x ) );

// Generate another matrix with a specified data type:
x = random.generate( [ 3, 3 ], 2.0, 3.0, 0.0, {
    'dtype': 'float32'
});
console.log( ndarray2array( x ) );

// Define arrays of distribution parameters:
var param1 = new ndarray( 'generic', [ 1.0, 10.0, 100.0 ], [ 3, 1 ], [ 1, 1 ], 0, 'row-major' );
var param2 = new ndarray( 'generic', [ 2.0, 20.0, 200.0 ], [ 3, 1 ], [ 1, 1 ], 0, 'row-major' );
var param3 = new ndarray( 'generic', [ 0.0, 100.0, 200.0 ], [ 3, 1 ], [ 1, 1 ], 0, 'row-major' );

// Broadcast the parameters to generate another 3x3 matrix of pseudorandom numbers:
x = random.generate( [ 3, 3 ], param1, param2, param3 );
console.log( ndarray2array( x ) );
```

</section>

<!-- /.examples -->

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## Notice

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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].

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[@stdlib/ndarray/policies]: https://www.npmjs.com/package/@stdlib/ndarray-policies

[@stdlib/ndarray/orders]: https://www.npmjs.com/package/@stdlib/ndarray-orders

[@stdlib/ndarray/base/broadcast-shapes]: https://www.npmjs.com/package/@stdlib/ndarray-base-broadcast-shapes

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