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@stdlib/math-base-special-powm1

Evaluate bˣ - 1.

https://github.com/stdlib-js/math-base-special-powm1

Science Score: 44.0%

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    CITATION.cff file
    Found CITATION.cff file
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Keywords

exponential function javascript math mathematics natural node node-js nodejs number pow power powm1 stdlib
Last synced: 4 months ago · JSON representation ·

Repository

Evaluate bˣ - 1.

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  • Stars: 2
  • Watchers: 3
  • Forks: 0
  • Open Issues: 0
  • Releases: 0
Topics
exponential function javascript math mathematics natural node node-js nodejs number pow power powm1 stdlib
Created over 4 years ago · Last pushed 4 months ago
Metadata Files
Readme Changelog Contributing License Code of conduct Citation Security

README.md

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!

powm1

NPM version Build Status Coverage Status <!-- dependencies -->

Evaluate bˣ - 1.

```math y = b^x - 1 ``` When `b` is close to `1` and/or `x` is small, this implementation is more accurate than naively computing `bˣ` minus `1`.
## Installation ```bash npm install @stdlib/math-base-special-powm1 ``` Alternatively, - To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]). - If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions). - For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]). The [branches.md][branches-url] 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 ```javascript var powm1 = require( '@stdlib/math-base-special-powm1' ); ``` #### powm1( b, x ) Evaluates `bˣ - 1`. ```javascript var y = powm1( 2.0, 3.0 ); // returns 7.0 y = powm1( 4.0, 0.5 ); // returns 1.0 y = powm1( 0.0, 100.0 ); // returns -1.0 y = powm1( 100.0, 0.0 ); // returns 0.0 y = powm1( 0.0, 0.0 ); // returns 0.0 y = powm1( 3.141592653589793, 5.0 ); // returns ~305.0197 y = powm1( NaN, 3.0 ); // returns NaN y = powm1( 5.0, NaN ); // returns NaN ```
## Examples ```javascript var discreteUniform = require( '@stdlib/random-array-discrete-uniform' ); var logEachMap = require( '@stdlib/console-log-each-map' ); var powm1 = require( '@stdlib/math-base-special-powm1' ); var opts = { 'dtype': 'float64' }; var b = discreteUniform( 100, 0, 10, opts ); var x = discreteUniform( 100, -5, 5, opts ); logEachMap( '%d^%d - 1 = %0.4f', b, x, powm1 ); ```
## C APIs
### Usage ```c #include "stdlib/math/base/special/powm1.h" ``` #### stdlib_base_powm1( b, x ) Evaluates `bˣ - 1`. ```c double out = stdlib_base_powm1( 3.141592653589793, 5.0 ); // returns ~305.0197 out = stdlib_base_powm1( 4.0, 0.5 ); // returns 1.0 ``` The function accepts the following arguments: - **b**: `[in] double` base. - **x**: `[in] double` exponent. ```c double stdlib_base_powm1( const double b, const double x ); ```
### Examples ```c #include "stdlib/math/base/special/powm1.h" #include #include int main( void ) { double out; double b; double x; int i; for ( i = 0; i < 100; i++ ) { b = ( ( (double)rand() / (double)RAND_MAX ) * 10.0 ); x = ( ( (double)rand() / (double)RAND_MAX ) * 10.0 ) - 5.0; out = stdlib_base_powm1( b, x ); printf( "powm1(%lf, %lf) = %lf\n", b, x, out ); } } ```

* * * ## See Also - [`@stdlib/math-base/special/pow`][@stdlib/math/base/special/pow]: exponential function.
* * * ## 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 © 2016-2025. The Stdlib [Authors][stdlib-authors].

Owner

  • Name: stdlib
  • Login: stdlib-js
  • Kind: organization

Standard library for JavaScript.

Citation (CITATION.cff) 

cff-version: 1.2.0
title: stdlib
message: >-
  If you use this software, please cite it using the
  metadata from this file.

type: software

authors:
  - name: The Stdlib Authors
    url: https://github.com/stdlib-js/stdlib/graphs/contributors

repository-code: https://github.com/stdlib-js/stdlib
url: https://stdlib.io

abstract: |
  Standard library for JavaScript and Node.js.

keywords:
  - JavaScript
  - Node.js
  - TypeScript
  - standard library
  - scientific computing
  - numerical computing
  - statistical computing

license: Apache-2.0 AND BSL-1.0

date-released: 2016

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  • Total packages: 1
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    • npm 125,380 last-month
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  • Total dependent packages: 7
  • Total dependent repositories: 16
  • Total versions: 11
  • Total maintainers: 4
npmjs.org: @stdlib/math-base-special-powm1

Evaluate bˣ - 1.

  • Homepage: https://stdlib.io
  • License: Apache-2.0 AND BSL-1.0
  • Latest release: 0.3.1
    published over 1 year ago
  • Versions: 11
  • Dependent Packages: 7
  • Dependent Repositories: 16
  • Downloads: 125,380 Last month
  • Docker Downloads: 24
Rankings
Downloads: 0.7%
Dependent packages count: 2.8%
Dependent repos count: 3.0%
Average: 7.3%
Stargazers count: 14.5%
Forks count: 15.4%
Maintainers (4)
planeshifter rreusser stdlib-bot kgryte
Funding
  • type: opencollective
  • url: https://opencollective.com/stdlib
Last synced: 4 months ago

Dependencies

package.json npm
  • @stdlib/bench ^0.0.x development
  • @stdlib/constants-float64-eps ^0.0.x development
  • @stdlib/math-base-special-round ^0.0.x development
  • @stdlib/random-base-randu ^0.0.x development
  • istanbul ^0.4.1 development
  • tap-spec 5.x.x development
  • tape git+https://github.com/kgryte/tape.git#fix/globby development
  • @stdlib/math-base-assert-is-nan ^0.0.x
  • @stdlib/math-base-special-abs ^0.0.x
  • @stdlib/math-base-special-expm1 ^0.0.x
  • @stdlib/math-base-special-ln ^0.0.x
  • @stdlib/math-base-special-pow ^0.0.x
  • @stdlib/math-base-special-trunc ^0.0.x
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