npm package: @stdlib/ndarray-vector-complex128
Description: Create a double-precision complex floating-point vector (i.e., a one-dimensional ndarray).
Author: The Stdlib Authors
Latest version: 0.1.1

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# Complex128Vector

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> Create a double-precision complex floating-point vector (i.e., a one-dimensional [ndarray][@stdlib/ndarray/ctor]).

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<section class="intro">

</section>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/ndarray-vector-complex128
```

</section>

<section class="usage">

## Usage

```javascript
var Complex128Vector = require( '@stdlib/ndarray-vector-complex128' );
```

#### Complex128Vector( \[options] )

Returns a one-dimensional double-precision complex floating-point [ndarray][@stdlib/ndarray/ctor].

```javascript
var numel = require( '@stdlib/ndarray-numel' );

var arr = new Complex128Vector();
// returns <ndarray>

var len = numel( arr );
// returns 0
```

The function accepts the following options:

-   **order**: specifies whether an [ndarray][@stdlib/ndarray/ctor] is `'row-major'` (C-style) or `'column-major'` (Fortran-style). Default: `'row-major'`.
-   **mode**: specifies how to handle indices which exceed array dimensions (see [`ndarray`][@stdlib/ndarray/ctor]). Default: `'throw'`.
-   **readonly**: boolean indicating whether an array should be **read-only**. Default: `false`.

#### Complex128Vector( length\[, options] )

Returns a one-dimensional double-precision complex floating-point [ndarray][@stdlib/ndarray/ctor] having a specified `length`.

```javascript
var numel = require( '@stdlib/ndarray-numel' );

var arr = new Complex128Vector( 5 );
// returns <ndarray>

var len1 = numel( arr );
// returns 5
```

#### Complex128Vector( obj\[, options] )

Creates a one-dimensional double-precision complex floating-point [ndarray][@stdlib/ndarray/ctor] from an array-like object or iterable.

```javascript
var numel = require( '@stdlib/ndarray-numel' );

var arr = new Complex128Vector( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
// returns <ndarray>

var len1 = numel( arr );
// returns 3
```

#### Complex128Vector( buffer\[, byteOffset\[, length]]\[, options] )

Returns a one-dimensional double-precision complex floating-point [ndarray][@stdlib/ndarray/ctor] view of an [`ArrayBuffer`][@stdlib/array/buffer].

```javascript
var ArrayBuffer = require( '@stdlib/array-buffer' );
var numel = require( '@stdlib/ndarray-numel' );

var buf = new ArrayBuffer( 64 );

var arr1 = new Complex128Vector( buf );
// returns <ndarray>

var len1 = numel( arr1 );
// returns 4

var arr2 = new Complex128Vector( buf, 16 );
// returns <ndarray>

var len2 = numel( arr2 );
// returns 3

var arr3 = new Complex128Vector( buf, 16, 1 );
// returns <ndarray>

var len3 = numel( arr3 );
// returns 1
```

</section>

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<section class="examples">

## Examples

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

```javascript
var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var sum = require( '@stdlib/blas-ext-sum' );
var map = require( '@stdlib/ndarray-map' );
var real = require( '@stdlib/complex-float64-real' );
var imag = require( '@stdlib/complex-float64-imag' );
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var Complex128Vector = require( '@stdlib/ndarray-vector-complex128' );

// Create a vector containing random values:
var x = new Complex128Vector( discreteUniform( 20, 0, 100 ) );

// Compute the sum:
var v = sum( x );
console.log( v.get() );

// Define a function which applies a threshold to real and imaginary components:
function threshold( v ) {
    if ( real( v ) > 10 && imag( v ) > 10 ) {
        return v;
    }
    return new Complex128( 0.0, 0.0 );
}

// Apply threshold:
var y = map( x, threshold );

// Recompute the sum:
v = sum( y );
console.log( v.get() );
```

</section>

<!-- /.examples -->

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* * *

## Notice

This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].

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## License

See [LICENSE][stdlib-license].


## Copyright

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

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