@stdlib/math-base-special-identity v0.2.1
Identity Function
Evaluate the identity function of a double-precision floating-point number.
The identity-function is defined as
for all x
.
Installation
npm install @stdlib/math-base-special-identity
Usage
var identity = require( '@stdlib/math-base-special-identity' );
identity( x )
Evaluates the identity function for a double-precision floating-point number.
var v = identity( -1.0 );
// returns -1.0
v = identity( 2.0 );
// returns 2.0
v = identity( 0.0 );
// returns 0.0
v = identity( -0.0 );
// returns -0.0
v = identity( NaN );
// returns NaN
Examples
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var identity = require( '@stdlib/math-base-special-identity' );
var rand;
var i;
for ( i = 0; i < 100; i++ ) {
rand = round( randu() * 100.0 ) - 50.0;
console.log( 'identity(%d) = %d', rand, identity( rand ) );
}
C APIs
Usage
#include "stdlib/math/base/special/identity.h"
stdlib_base_identity( x )
Evaluates the identity function for a double-precision floating-point number.
double y = stdlib_base_identity( 2.0 );
// returns 2.0
The function accepts the following arguments:
- x:
[in] double
input value.
double stdlib_base_identity( const double x );
Examples
#include "stdlib/math/base/special/identity.h"
#include <stdio.h>
int main( void ) {
const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
double y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_identity( x[ i ] );
printf( "f(%lf) = %lf\n", x[ i ], y );
}
}
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.