cneg

Negate a double-precision complex floating-point number.

Usage

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

cneg( z )

Negates a double-precision complex floating-point number.

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

var z = new Complex128( -4.2, 5.5 );

var out = cneg( z );
// returns <Complex128>

var re = real( out );
// returns 4.2

var im = imag( out );
// returns -5.5

z = new Complex128( 0.0, 0.0 );

out = cneg( z );
// returns <Complex128>

re = real( out );
// returns -0.0

im = imag( out );
// returns -0.0

z = new Complex128( NaN, NaN );

out = cneg( z );
// returns <Complex128>

re = real( out );
// returns NaN

im = imag( out );
// returns NaN

Examples

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

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

var z;
var o;
var i;

for ( i = 0; i < 100; i++ ) {
    z = randomComplex();
    o = cneg( z );
    console.log( 'negate(%s) = %s', z.toString(), o.toString() );
}

C APIs

Usage

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

stdlib_base_cneg( z )

Negates a double-precision complex floating-point number.

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

stdlib_complex128_t z = stdlib_complex128( 3.0, -2.0 );

stdlib_complex128_t out = stdlib_base_cneg( z );

double re = stdlib_complex128_real( out );
// returns -3.0

double im = stdlib_complex128_imag( out );
// returns 2.0

The function accepts the following arguments:

z: [in] stdlib_complex128_t input value.

stdlib_complex128_t stdlib_base_cneg( const stdlib_complex128_t z );

Examples

#include "stdlib/math/base/ops/cneg.h"
#include "stdlib/complex/float64/ctor.h"
#include "stdlib/complex/float64/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_complex128_reim( v, &re, &im );
        printf( "z = %lf + %lfi\n", re, im );

        y = stdlib_base_cneg( v );
        stdlib_complex128_reim( y, &re, &im );
        printf( "cneg(z) = %lf + %lfi\n", re, im );
    }
}