cflipsignf

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

Usage

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

cflipsignf( z, y )

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

var Complex64 = require( '@stdlib/complex/float32/ctor' );
var real = require( '@stdlib/complex/float32/real' );
var imag = require( '@stdlib/complex/float32/imag' );

var v = cflipsignf( new Complex64( -4.0, 5.0 ), -1.0 );
// returns <Complex64>

var re = real( v );
// returns 4.0

var im = imag( v );
// returns -5.0

Examples

var uniform = require( '@stdlib/random/base/uniform' ).factory;
var Complex64 = require( '@stdlib/complex/float32/ctor' );
var cflipsignf = require( '@stdlib/math/base/special/cflipsignf' );

var rand = uniform( -50.0, 50.0 );

var z;
var y;
var i;
for ( i = 0; i < 100; i++ ) {
    z = new Complex64( rand(), rand() );
    y = rand();
    console.log( 'cflipsignf(%s, %d) = %s', z, y, cflipsignf( z, y ) );
}

C APIs

Usage

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

stdlib_base_cflipsignf( z, y )

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

#include <complex.h>

float complex y = stdlib_base_cflipsignf( 2.0-1.0*I, -1.0 );
// returns -2.0+1.0*I

The function accepts the following arguments:

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

float complex stdlib_base_cflipsignf( const float complex z, const float y );

Examples

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

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

    float complex v;
    float complex y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        v = x[ i ];
        y = stdlib_base_cflipsignf( v, -1.0f );
        printf( "cflipsignf(%f + %fi, %f) = %f + %fi\n", crealf( v ), cimagf( v ), -1.0f, crealf( y ), cimagf( y ) );
    }
}