Negate a double-precision complex floating-point number.
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> Negate a double-precision complex floating-point number.
``bash`
npm install @stdlib/math-base-ops-cneg
`javascript`
var cneg = require( '@stdlib/math-base-ops-cneg' );
#### cneg( z )
Negates a double-precision complex floating-point number.
`javascript
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
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
re = real( out );
// returns -0.0
im = imag( out );
// returns -0.0
z = new Complex128( NaN, NaN );
out = cneg( z );
// returns
re = real( out );
// returns NaN
im = imag( out );
// returns NaN
`
`javascript
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`
#include "stdlib/math/base/ops/cneg.h"
#### stdlib_base_cneg( z )
Negates a double-precision complex floating-point number.
`c
#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.
`c`
stdlib_complex128_t stdlib_base_cneg( const stdlib_complex128_t z );
`c
#include "stdlib/math/base/ops/cneg.h"
#include "stdlib/complex/float64/ctor.h"
#include "stdlib/complex/float64/reim.h"
#include
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 );
}
}
`
*
- [@stdlib/math-base/special/cabs][@stdlib/math/base/special/cabs]: compute the absolute value of a double-precision complex floating-point number.
*
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].
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---
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