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Identity Function

Evaluate the identity function of an unsigned 8-bit integer.

The identity-function is defined as

$$f(x) = x$$

for all x.

Installation

npm install @stdlib/number-uint8-base-identity

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var identity = require( '@stdlib/number-uint8-base-identity' );

identity( x )

Evaluates the identity function for an unsigned 8-bit integer.

var v = identity( 1 );
// returns 1

v = identity( 2 );
// returns 2

v = identity( 0 );
// returns 0

v = identity( 255 );
// returns 255

Examples

var discreteUniform = require( '@stdlib/random-array-discrete-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var identity = require( '@stdlib/number-uint8-base-identity' );

var opts = {
    'dtype': 'uint8'
};

// Create an array of random values:
var x = discreteUniform( 100, 0, 50, opts );

// Perform element-wise operation:
logEachMap( 'identity(%d) = %d', x, identity );

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C APIs

Usage

#include "stdlib/number/uint8/base/identity.h"

stdlib_base_uint8_identity( x )

Evaluates the identity function for an unsigned 8-bit integer.

#include <stdint.h>

uint8_t y = stdlib_base_uint8_identity( 2 );
// returns 2

The function accepts the following arguments:

• x: [in] uint8_t input value.

uint8_t stdlib_base_uint8_identity( const uint8_t x );

Examples

#include "stdlib/number/uint8/base/identity.h"
#include <stdint.h>
#include <stdio.h>

int main( void ) {
    const uint8_t x[] = { 3, 5, 10, 12 };

    uint8_t y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        y = stdlib_base_uint8_identity( x[ i ] );
        printf( "f(%u) = %u\n", x[ i ], y );
    }
}

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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

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License

See LICENSE.

Copyright

Copyright © 2016-2025. The Stdlib Authors.