@stdlib/math-base-special-exp
v0.2.5TypeScript
Natural exponential function.
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Published by The Stdlib Authors
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About stdlib...
exp
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> Natural [exponential function][exponential-function].
The natural [exponential function][exponential-function] is defined as
where e is [Euler's][@stdlib/constants/float64/e] number.
Installation
``bash`
npm install @stdlib/math-base-special-exp
Usage
`javascript`
var exp = require( '@stdlib/math-base-special-exp' );
#### exp( x )
Evaluates the natural [exponential function][exponential-function].
`javascript
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
`javascript
var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var exp = require( '@stdlib/math-base-special-exp' );
var opts = {
'dtype': 'float64'
};
var x = uniform( 100, -50.0, 50.0, opts );
logEachMap( 'e^%0.4f = %0.4f', x, exp );
`
*
C APIs
$3
`c`
#include "stdlib/math/base/special/exp.h"
#### stdlib_base_exp( x )
Evaluates the natural [exponential function][exponential-function].
`c
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.
`c`
double stdlib_base_exp( const double x );
$3
`c
#include "stdlib/math/base/special/exp.h"
#include
#include
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][@stdlib/math/base/special/exp10]: base 10 exponential function.
- [@stdlib/math-base/special/exp2][@stdlib/math/base/special/exp2]: base 2 exponential function.
- [@stdlib/math-base/special/expm1][@stdlib/math/base/special/expm1]: compute exp(x) - 1.
- [@stdlib/math-base/special/ln][@stdlib/math/base/special/ln]: evaluate the natural logarithm of a double-precision floating-point number.
*
Notice
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
#### Community
[![Chat][chat-image]][chat-url]
---
Copyright
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/math-base-special-exp/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/math-base-special-exp?branch=main
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[chat-url]: https://stdlib.zulipchat.com
[stdlib]: https://github.com/stdlib-js/stdlib
[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors
[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/math-base-special-exp/tree/deno
[deno-readme]: https://github.com/stdlib-js/math-base-special-exp/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/math-base-special-exp/tree/umd
[umd-readme]: https://github.com/stdlib-js/math-base-special-exp/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/math-base-special-exp/tree/esm
[esm-readme]: https://github.com/stdlib-js/math-base-special-exp/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/math-base-special-exp/blob/main/branches.md
[exponential-function]: https://en.wikipedia.org/wiki/Exponential_function
[@stdlib/constants/float64/e]: https://www.npmjs.com/package/@stdlib/constants-float64-e
[@stdlib/math/base/special/exp10]: https://www.npmjs.com/package/@stdlib/math-base-special-exp10
[@stdlib/math/base/special/exp2]: https://www.npmjs.com/package/@stdlib/math-base-special-exp2
[@stdlib/math/base/special/expm1]: https://www.npmjs.com/package/@stdlib/math-base-special-expm1
[@stdlib/math/base/special/ln]: https://www.npmjs.com/package/@stdlib/math-base-special-ln