npm package: @stdlib/complex-float64-reim
Description: Return the real and imaginary components of a double-precision complex floating-point number.
Author: The Stdlib Authors
Latest version: 0.1.4

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# reim

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> Return the real and imaginary components of a double-precision complex floating-point number.

<!-- 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>

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<!-- Package usage documentation. -->

<section class="installation">

## Installation

```bash
npm install @stdlib/complex-float64-reim
```

</section>

<section class="usage">

## Usage

```javascript
var reim = require( '@stdlib/complex-float64-reim' );
```

#### reim( z )

Returns the **real** and **imaginary** components of a double-precision complex floating-point number.

```javascript
var Complex128 = require( '@stdlib/complex-float64-ctor' );

var z = new Complex128( 5.0, 3.0 );
var out = reim( z );
// returns <Float64Array>[ 5.0, 3.0 ]
```

</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">

</section>

<!-- /.notes -->

<!-- Package usage examples. -->

<section class="examples">

## Examples

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

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

```javascript
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var filledarrayBy = require( '@stdlib/array-filled-by' );
var reim = require( '@stdlib/complex-float64-reim' );

function random() {
    return new Complex128( discreteUniform( -10, 10 ), discreteUniform( -10, 10 ) );
}

// Generate an array of random complex numbers:
var x = filledarrayBy( 100, 'complex128', random );
// returns <Complex128Array>

// Return the real and imaginary components of each complex number...
var out;
var z;
var i;
for ( i = 0; i < x.length; i++ ) {
    z = x.get( i );
    out = reim( z );
    console.log( '%s => %d, %d', z.toString(), out[ 0 ], out[ 1 ] );
}
```

</section>

<!-- /.examples -->

<!-- C interface documentation. -->

* * *

<section class="c">

## C APIs

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<section class="intro">

</section>

<!-- /.intro -->

<!-- C usage documentation. -->

<section class="usage">

### Usage

```c
#include "stdlib/complex/float64/reim.h"
```

#### stdlib_complex128_reim( z, \*re, \*im )

Returns the real and imaginary components of a double-precision complex floating-point number.

```c
#include "stdlib/complex/float64/ctor.h"

stdlib_complex128_t z = stdlib_complex128( 5.0, 2.0 );

// ...

double re;
double im;

stdlib_complex128_reim( z, &re, &im );
```

The function accepts the following arguments:

-   **z**: `[in] stdlib_complex128_t` double-precision complex floating-point number.
-   **re**: `[out] double*` destination for real component.
-   **im**: `[out] double*` destination for imaginary component.

```c
void stdlib_complex128_reim( const stdlib_complex128_t z, double *re, double *im );
```

</section>

<!-- /.usage -->

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

<section class="notes">

</section>

<!-- /.notes -->

<!-- C API usage examples. -->

<section class="examples">

### Examples

```c
#include "stdlib/complex/float64/reim.h"
#include "stdlib/complex/float64/ctor.h"
#include <stdio.h>

int main( void ) {
    const stdlib_complex128_t x[] = {
        stdlib_complex128( 5.0, 2.0 ),
        stdlib_complex128( -2.0, 1.0 ),
        stdlib_complex128( 0.0, -0.0 ),
        stdlib_complex128( 0.0/0.0, 0.0/0.0 )
    };

    double re;
    double im;
    int i;
    for ( i = 0; i < 4; i++ ) {
        stdlib_complex128_reim( x[ i ], &re, &im );
        printf( "reim(v) = %lf, %lf\n", re, im );
    }
}
```

</section>

<!-- /.examples -->

</section>

<!-- /.c -->

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</section>

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<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/complex-float64/imag`][@stdlib/complex/float64/imag]</span><span class="delimiter">: </span><span class="description">return the imaginary component of a double-precision complex floating-point number.</span>
-   <span class="package-name">[`@stdlib/complex-float64/real`][@stdlib/complex/float64/real]</span><span class="delimiter">: </span><span class="description">return the real component of a double-precision complex floating-point number.</span>

</section>

<!-- /.related -->

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<section class="main-repo" >

* * *

## 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].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

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

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[@stdlib/complex/float64/imag]: https://www.npmjs.com/package/@stdlib/complex-float64-imag

[@stdlib/complex/float64/real]: https://www.npmjs.com/package/@stdlib/complex-float64-real

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