@stdlib/math-base-special-exp

About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

exp

Natural exponential function.

The natural exponential function is defined as

where e is Euler's number.

Installation

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

Usage

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

exp( x )

Evaluates the natural exponential function.

var v = exp( 4.0 );
// returns ~54.5982

v = exp( -9.0 );
// returns ~1.234e-4

v = exp( 0.0 );
// returns 1.0

v = exp( NaN );
// returns NaN

Examples

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

var x;
var i;

for ( i = 0; i < 100; i++ ) {
    x = (randu()*100.0) - 50.0;
    console.log( 'e^%d = %d', x, exp( x ) );
}

---

C APIs

Usage

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

stdlib_base_exp( x )

Evaluates the natural exponential function.

double out = stdlib_base_exp( 4.0 );
// returns ~54.5982

out = stdlib_base_exp( -9.0 );
// returns ~1.234e-4

The function accepts the following arguments:

• x: [in] double input value.

double stdlib_base_exp( const double x );

Examples

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

int main( void ) {
    double x;
    double v;
    int i;
    
    for ( i = 0; i < 100; i++ ) {
        x = ( (double)rand() / (double)RAND_MAX ) * 100.0;
        v = stdlib_base_exp( x );
        printf( "e^%lf = %lf\n", x, v );
    }
}

---

See Also

• @stdlib/math-base/special/exp10: base 10 exponential function.
• @stdlib/math-base/special/exp2: base 2 exponential function.
• @stdlib/math-base/special/expm1: compute exp(x) - 1.
• @stdlib/math-base/special/ln: evaluate the natural logarithm of a double-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

---

Copyright

Copyright © 2016-2024. The Stdlib Authors.

Changelog

0.2.4 (2024-07-28)

<section class="commits">

Commits

<details>

• 55ec8ed - docs: remove comment (by Athan Reines)
• 2777e4b - bench: resolve lint errors in benchmarks (by Athan Reines)
• a78f7d1 - style: add missing spaces (by Philipp Burckhardt)
• 41d41e9 - test: include trailing newlines in Julia-generated JSON fixtures (by Philipp Burckhardt)
• 9ed7d0e - chore: add missing trailing newlines (by Philipp Burckhardt)

</details> </section> <!-- /.commits --> <section class="contributors">

Contributors

A total of 2 people contributed to this release. Thank you to the following contributors:

• Athan Reines
• Philipp Burckhardt

</section> <!-- /.contributors --> </section> <!-- /.release --> <section class="release" id="v0.2.3">