@stdlib/math-base-ops-cdiv

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

cdiv

Divide two double-precision complex floating-point numbers.

Installation

npm install @stdlib/math-base-ops-cdiv

Usage

var cdiv = require( '@stdlib/math-base-ops-cdiv' );

cdiv( z1, z2 )

Divides two double-precision complex floating-point numbers.

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

var z1 = new Complex128( -13.0, -1.0 );
var z2 = new Complex128( -2.0, 1.0 );

var v = cdiv( z1, z2 );
// returns <Complex128>

var re = real( v );
// returns 5.0

var im = imag( v );
// returns 3.0

Examples

var Complex128 = require( '@stdlib/complex-float64' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var real = require( '@stdlib/complex-real' );
var imag = require( '@stdlib/complex-imag' );
var cdiv = require( '@stdlib/math-base-ops-cdiv' );

function randomComplex() {
    var re = discreteUniform( -50, 50 );
    var im = discreteUniform( -50, 50 );
    return new Complex128( re, im );
}

var z1;
var z2;
var z3;
var i;
for ( i = 0; i < 100; i++ ) {
    z1 = randomComplex();
    z2 = randomComplex();
    z3 = cdiv( z1, z2 );
    console.log( '(%s) / (%s) = %s', z1.toString(), z2.toString(), z3.toString() );
}

---

C APIs

Usage

#include "stdlib/math/base/ops/cdiv.h"

stdlib_base_cdiv( z1, z2 )

Divides two double-precision complex floating-point numbers.

#include "stdlib/complex/float64.h"
#include "stdlib/complex/real.h"
#include "stdlib/complex/imag.h"

stdlib_complex128_t z1 = stdlib_complex128( -13.0, -1.0 );
stdlib_complex128_t z2 = stdlib_complex128( -2.0, 1.0 );

stdlib_complex128_t out = stdlib_base_cdiv( z1, z2 );

double re = stdlib_real( out );
// returns 5.0

double im = stdlib_imag( out );
// returns 3.0

The function accepts the following arguments:

• z1: [in] stdlib_complex128_t input value.
• z2: [in] stdlib_complex128_t input value.

stdlib_complex128_t stdlib_base_cdiv( const stdlib_complex128_t z1, const stdlib_complex128_t z2 );

Examples

#include "stdlib/math/base/ops/cdiv.h"
#include "stdlib/complex/float64.h"
#include "stdlib/complex/reim.h"
#include <stdio.h>

int main( void ) {
    const stdlib_complex128_t x[] = {
        stdlib_complex128( 3.14, 1.5 ),
        stdlib_complex128( -3.14, 1.5 ),
        stdlib_complex128( 0.0, -0.0 ),
        stdlib_complex128( 0.0/0.0, 0.0/0.0 )
    };

    stdlib_complex128_t v;
    stdlib_complex128_t y;
    double re;
    double im;
    int i;
    for ( i = 0; i < 4; i++ ) {
        v = x[ i ];
        stdlib_reim( v, &re, &im );
        printf( "z = %lf + %lfi\n", re, im );

        y = stdlib_base_cdiv( v, v );
        stdlib_reim( y, &re, &im );
        printf( "cdiv(z, z) = %lf + %lfi\n", re, im );
    }
}

---

References

• Smith, Robert L. 1962. "Algorithm 116: Complex Division." Commun. ACM 5 (8). New York, NY, USA: ACM: 435. doi:10.1145/368637.368661.
• Stewart, G. W. 1985. "A Note on Complex Division." ACM Trans. Math. Softw. 11 (3). New York, NY, USA: ACM: 238–41. doi:10.1145/214408.214414.
• Priest, Douglas M. 2004. "Efficient Scaling for Complex Division." ACM Trans. Math. Softw. 30 (4). New York, NY, USA: ACM: 389–401. doi:10.1145/1039813.1039814.
• Baudin, Michael, and Robert L. Smith. 2012. "A Robust Complex Division in Scilab." arXiv abs/1210.4539 [cs.MS] (October): 1–25. <https://arxiv.org/abs/1210.4539>.

---

See Also

• @stdlib/math-base/ops/cadd: add two double-precision complex floating-point numbers.
• @stdlib/math-base/ops/cmul: multiply two double-precision complex floating-point numbers.
• @stdlib/math-base/ops/csub: subtract two double-precision complex floating-point numbers.

---

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

---

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.