# @stdlib/complex-realf

0.2.0 • Public • Published

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# realf

Return the real component of a single-precision complex floating-point number.

## Installation

`npm install @stdlib/complex-realf`

## Usage

`var realf = require( '@stdlib/complex-realf' );`

#### realf( z )

Returns the real component of a single-precision complex floating-point number.

```var Complex64 = require( '@stdlib/complex-float32' );

var z = new Complex64( 5.0, 3.0 );
var re = realf( z );
// returns 5.0```

## Examples

```var Complex64 = require( '@stdlib/complex-float32' );
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var realf = require( '@stdlib/complex-realf' );

var re;
var im;
var z;
var i;

for ( i = 0; i < 100; i++ ) {
re = round( (randu()*100.0) - 50.0 );
im = round( (randu()*50.0) - 25.0 );
z = new Complex64( re, im );
console.log( 'realf(%s) = %d', z.toString(), realf( z ) );
}```

## C APIs

### Usage

`#include "stdlib/complex/realf.h"`

#### stdlib_realf( z )

Returns the real component of a single-precision complex floating-point number.

```#include "stdlib/complex/float32.h"

stdlib_complex64_t z = stdlib_complex64( 5.0f, 2.0f );

// ...

float re = stdlib_realf( z );
// returns 5.0f```

The function accepts the following arguments:

• z: `[in] stdlib_complex64_t` single-precision complex floating-point number.
`float stdlib_realf( const stdlib_complex64_t z );`

### Examples

```#include "stdlib/complex/realf.h"
#include "stdlib/complex/float32.h"
#include <stdio.h>

int main( void ) {
const stdlib_complex64_t x[] = {
stdlib_complex64( 5.0f, 2.0f ),
stdlib_complex64( -2.0f, 1.0f ),
stdlib_complex64( 0.0f, -0.0f ),
stdlib_complex64( 0.0f/0.0f, 0.0f/0.0f )
};

int i;
for ( i = 0; i < 4; i++ ) {
printf( "realf(v) = %f\n", stdlib_realf( x[ i ] ) );
}
}```

## Notice

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

## Package Sidebar

### Install

`npm i @stdlib/complex-realf`

### Repository

github.com/stdlib-js/complex-realf

stdlib.io

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