Return the real component of a double-precision complex floating-point number.
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> Return the real component of a double-precision complex floating-point number.
``bash`
npm install @stdlib/complex-float64-real
`javascript`
var real = require( '@stdlib/complex-float64-real' );
#### real( z )
Returns the real component of a double-precision complex floating-point number.
`javascript
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var z = new Complex128( 5.0, 3.0 );
var re = real( z );
// returns 5.0
`
`javascript
var Complex128 = require( '@stdlib/complex-float64-ctor' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var filledarrayBy = require( '@stdlib/array-filled-by' );
var real = require( '@stdlib/complex-float64-real' );
function random() {
return new Complex128( discreteUniform( -10, 10 ), discreteUniform( -10, 10 ) ); // eslint-disable-line max-len
}
// Generate an array of random complex numbers:
var x = filledarrayBy( 100, 'complex128', random );
// returns
// Retrieve the real component of each complex number...
var z;
var i;
for ( i = 0; i < x.length; i++ ) {
z = x.get( i );
console.log( 'real(%s) = %d', z.toString(), real( z ) );
}
`
*
`c`
#include "stdlib/complex/float64/real.h"
#### stdlib_complex128_real( z )
Returns the real component of a double-precision complex floating-point number.
`c
#include "stdlib/complex/float64/ctor.h"
stdlib_complex128_t z = stdlib_complex128( 5.0, 2.0 );
// ...
double re = stdlib_complex128_real( z );
// returns 5.0
`
The function accepts the following arguments:
- z: [in] stdlib_complex128_t double-precision complex floating-point number.
`c`
double stdlib_complex128_real( const stdlib_complex128_t z );
`c
#include "stdlib/complex/float64/real.h"
#include "stdlib/complex/float64/ctor.h"
#include
int main( void ) {
const stdlib_complex128_t x[] = {
stdlib_complex128( 5.0, 2.0 ),
stdlib_complex128( -2.0, 1.0 ),
stdlib_complex128( 0.0, -0.0 ),
stdlib_complex128( 0.0/0.0, 0.0/0.0 )
};
int i;
for ( i = 0; i < 4; i++ ) {
printf( "real(v) = %lf\n", stdlib_complex128_real( x[ i ] ) );
}
}
`
*
- [@stdlib/complex-float64/imag][@stdlib/complex/float64/imag]: return the imaginary component of a double-precision complex floating-point number.
- [@stdlib/complex-float64/reim][@stdlib/complex/float64/reim]: return the real and imaginary components 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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Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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