README.md

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reim

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

Installation

npm install @stdlib/complex-reim

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

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

reim( z )

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

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

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

Examples

var Complex128 = require( '@stdlib/complex-float64' );
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var reim = require( '@stdlib/complex-reim' );

var out;
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 Complex128( re, im );
    out = reim( z );
    console.log( '%s => %d, %d', z.toString(), out[ 0 ], out[ 1 ] );
}

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C APIs

Usage

#include "stdlib/complex/reim.h"

stdlib_reim( z, *re, *im )

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

#include "stdlib/complex/float64.h"

stdlib_complex128_t z = stdlib_complex128( 5.0, 2.0 );

// ...

double re;
double im;

stdlib_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.

void stdlib_reim( const stdlib_complex128_t z, double *re, double *im );

Examples

#include "stdlib/complex/reim.h"
#include "stdlib/complex/float64.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_reim( x[ i ], &re, &im );
        printf( "reim(v) = %lf, %lf\n", re, im );
    }
}

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See Also

• @stdlib/complex-imag: return the imaginary component of a double-precision complex floating-point number.
• @stdlib/complex-real: return the real component of a double-precision complex floating-point number.

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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.

Community

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.