time-to-botec/js/node_modules/@stdlib/math/base/ops/cneg/README.md

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# Negate

> Negate a complex number.

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## Usage

```javascript
var cneg = require( '@stdlib/math/base/ops/cneg' );
```

#### cneg( \[out,] re, im )

Negates a `complex` number comprised of a **real** component `re` and an **imaginary** component `im`.

```javascript
var v = cneg( -4.2, 5.5 );
// returns [ 4.2, -5.5 ]

v = cneg( 0.0, 0.0 );
// returns [ -0.0, -0.0 ]

v = cneg( NaN, NaN );
// returns [ NaN, NaN ]
```

By default, the function returns real and imaginary components as a two-element `array`. To avoid unnecessary memory allocation, the function supports providing an output (destination) object.

```javascript
var Float64Array = require( '@stdlib/array/float64' );

var out = new Float64Array( 2 );

var v = cneg( out, -4.2, 5.5 );
// returns <Float64Array>[ 4.2, -5.5 ]

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

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## Examples

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

```javascript
var Complex128 = require( '@stdlib/complex/float64' );
var randu = require( '@stdlib/random/base/randu' );
var real = require( '@stdlib/complex/real' );
var imag = require( '@stdlib/complex/imag' );
var cneg = require( '@stdlib/math/base/ops/cneg' );

var re;
var im;
var z;
var o;
var w;
var i;

for ( i = 0; i < 100; i++ ) {
    re = ( randu()*100.0 ) - 50.0;
    im = ( randu()*100.0 ) - 50.0;
    z = new Complex128( re, im );
    o = cneg( real(z), imag(z) );
    w = new Complex128( o[ 0 ], o[ 1 ] );
    console.log( 'negate(%s) = %s', z.toString(), w.toString() );
}
```

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