Identity Function

Evaluate the identity function of a single-precision complex floating-point number.

The identity-function is defined as

for all z.

Installation

npm install @stdlib/complex-float32-base-identity

Usage

var cidentityf = require( '@stdlib/complex-float32-base-identity' );

cidentityf( z )

Evaluates the identity function for a single-precision complex floating-point number.

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

var v = cidentityf( new Complex64( -1.0, 2.0 ) );
// returns <Complex64>[ -1.0, 2.0 ]

Examples

var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var Complex64 = require( '@stdlib/complex-float32-ctor' );
var cidentityf = require( '@stdlib/complex-float32-base-identity' );

var z;
var i;
for ( i = 0; i < 100; i++ ) {
    z = new Complex64( discreteUniform( -50, 50 ), discreteUniform( -50, 50 ) );
    console.log( 'identity(%s) = %s', z, cidentityf( z ) );
}

C APIs

Usage

#include "stdlib/complex/float32/base/identity.h"

stdlib_base_complex64_identity( z )

Evaluates the identity function for a single-precision complex floating-point number.

#include "stdlib/complex/float32/ctor.h"
#include "stdlib/complex/float32/real.h"
#include "stdlib/complex/float32/imag.h"

stdlib_complex64_t z = stdlib_complex64( 2.0f, 2.0f );
stdlib_complex64_t out = stdlib_base_complex64_identity( z );

float re = stdlib_complex64_real( out );
// returns 2.0f

float im = stdlib_complex64_imag( out );
// returns 2.0f

The function accepts the following arguments:

• z: [in] stdlib_complex64_t input value.

stdlib_complex64_t stdlib_base_complex64_identity( const stdlib_complex64_t z );

Examples

#include "stdlib/complex/float32/base/identity.h"
#include "stdlib/complex/float32/ctor.h"
#include "stdlib/complex/float32/reim.h"
#include <stdio.h>

int main( void ) {
    const stdlib_complex64_t x[] = {
        stdlib_complex64( 3.14f, 1.0f ),
        stdlib_complex64( -3.14f, -1.0f ),
        stdlib_complex64( 0.0f, 0.0f ),
        stdlib_complex64( 0.0f/0.0f, 0.0f/0.0f )
    };

    stdlib_complex64_t v;
    stdlib_complex64_t y;
    float re1;
    float im1;
    float re2;
    float im2;
    int i;
    for ( i = 0; i < 4; i++ ) {
        v = x[ i ];
        y = stdlib_base_complex64_identity( v );
        stdlib_complex64_reim( v, &re1, &im1 );
        stdlib_complex64_reim( y, &re2, &im2 );
        printf( "cidentity(%f + %fi) = %f + %fi\n", re1, im1, re2, im2 );
    }
}

See Also

• @stdlib/complex-float64/base/identity: evaluate the identity function for a double-precision complex floating-point number.
• @stdlib/number-float32/base/identity: evaluate the identity function for a single-precision floating-point number.

Notice

This package is part of 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, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2026. The Stdlib Authors.