cflipsign

Return a double-precision complex floating-point number with the same magnitude as z and the sign of y*z.

Usage

var cflipsign = require( '@stdlib/math/base/special/cflipsign' );

cflipsign( z, y )

Returns a double-precision complex floating-point number with the same magnitude as z and the sign of y*z.

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

var v = cflipsign( new Complex128( -4.2, 5.5 ), -1.0 );
// returns <Complex128>

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

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

Examples

var uniform = require( '@stdlib/random/base/uniform' ).factory;
var Complex128 = require( '@stdlib/complex/float64' );
var cflipsign = require( '@stdlib/math/base/special/cflipsign' );

var rand = uniform( -50.0, 50.0 );

var z;
var y;
var i;
for ( i = 0; i < 100; i++ ) {
    z = new Complex128( rand(), rand() );
    y = rand();
    console.log( 'cflipsign(%s, %d) = %s', z, y, cflipsign( z, y ) );
}

C APIs

Usage

#include "stdlib/math/base/special/cflipsign.h"

stdlib_base_cflipsign( z, y )

Returns a double-precision complex floating-point number with the same magnitude as z and the sign of y*z.

#include <complex.h>

double complex y = stdlib_base_cflipsign( 2.5-1.5*I, -1.0 );
// returns -2.5+1.5*I

The function accepts the following arguments:

z: [in] double complex input value.
y: [in] double number from which to derive the sign.

double complex stdlib_base_cflipsign( const double complex z, const double y );

Examples

#include "stdlib/math/base/special/cflipsign.h"
#include <stdio.h>
#include <complex.h>

int main() {
    double complex x[] = { 3.14+1.5*I, -3.14-1.5*I, 0.0+0.0*I, 0.0/0.0+0.0/0.0*I };

    double complex v;
    double complex y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        v = x[ i ];
        y = stdlib_base_cflipsign( v, -1.0 );
        printf( "cflipsign(%lf + %lfi, %lf) = %lf + %lfi\n", creal( v ), cimag( v ), -1.0, creal( y ), cimag( y ) );
    }
}