Identity Function

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

The identity-function is defined as

for all x.

Installation

npm install @stdlib/math-base-special-identityf

Usage

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

identityf( x )

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

var v = identityf( -1.0 );
// returns -1.0

v = identityf( 2.0 );
// returns 2.0

v = identityf( 0.0 );
// returns 0.0

v = identityf( -0.0 );
// returns -0.0

v = identityf( NaN );
// returns NaN

Examples

var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var identityf = require( '@stdlib/math-base-special-identityf' );

var rand;
var i;

for ( i = 0; i < 100; i++ ) {
    rand = round( randu() * 100.0 ) - 50.0;
    console.log( 'identity(%d) = %d', rand, identityf( rand ) );
}

C APIs

Usage

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

stdlib_base_identityf( x )

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

float y = stdlib_base_identityf( 2.0f );
// returns 2.0f

The function accepts the following arguments:

• x: [in] float input value.

float stdlib_base_identityf( const float x );

Examples

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

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

    float y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        y = stdlib_base_identityf( x[ i ] );
        printf( "f(%f) = %f\n", x[ i ], y );
    }
}

See Also

• @stdlib/math-base/special/identityf: 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 © 2016-2024. The Stdlib Authors.