@stdlib/number-float64-base-exponent
Advanced tools
Return an integer corresponding to the unbiased exponent of a double-precision floating-point number.
@stdlib/number-float64-base-exponent is a package that provides functionality to extract the exponent from a double-precision floating-point number (float64). This can be useful in various numerical computations where understanding the exponent part of a floating-point number is necessary.
Extract Exponent
This feature allows you to extract the exponent from a given double-precision floating-point number. In this example, the exponent of 4.0 is extracted, which is 2.
const exponent = require('@stdlib/number-float64-base-exponent');
const exp = exponent(4.0); // returns 2The math-float64-exponent package provides similar functionality to extract the exponent from a float64 number. It is comparable to @stdlib/number-float64-base-exponent in terms of functionality but may differ in implementation details and additional features.
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!
Return an integer corresponding to the unbiased exponent of a double-precision floating-point number.
npm install @stdlib/number-float64-base-exponent
var exponent = require( '@stdlib/number-float64-base-exponent' );
Returns an integer corresponding to the unbiased exponent of a double-precision floating-point number.
var exp = exponent( 3.14e307 ); // => 2**1021 ~ 1e307
// returns 1021
exp = exponent( 3.14e-307 ); // => 2**-1019 ~ 1e-307
// returns -1019
exp = exponent( -3.14 );
// returns 1
exp = exponent( 0.0 );
// returns -1023
exp = exponent( NaN );
// returns 1024
var randu = require( '@stdlib/random-base-uniform' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var pow = require( '@stdlib/math-base-special-pow' );
var exponent = require( '@stdlib/number-float64-base-exponent' );
var frac;
var exp;
var x;
var e;
var i;
// Generate random numbers and extract their exponents...
for ( i = 0; i < 100; i++ ) {
frac = randu( 0.0, 10.0 );
exp = discreteUniform( -323, 323 );
x = frac * pow( 10.0, exp );
e = exponent( x );
console.log( 'x: %d. unbiased exponent: %d.', x, e );
}
#include "stdlib/number/float64/base/exponent.h"
Returns an integer corresponding to the unbiased exponent of a double-precision floating-point number.
#include <stdint.h>
int32_t out = stdlib_base_float64_exponent( 3.14 );
The function accepts the following arguments:
[in] double input value.int32_t stdlib_base_float64_exponent( const double x );
#include "stdlib/number/float64/base/exponent.h"
#include <stdint.h>
#include <stdio.h>
#include <inttypes.h>
int main( void ) {
double x[] = { 4.0, 0.0, -0.0, 1.0, -1.0, 3.14, -3.14, 1.0e308, -1.0e308, 1.0/0.0, -1.0/0.0, 0.0/0.0 };
int32_t out;
int i;
for ( i = 0; i < 12; i++ ) {
out = stdlib_base_float64_exponent( x[ i ] );
printf( "%lf => out: %" PRId32 "\n", x[ i ], out );
}
}
@stdlib/number-float32/base/exponent: return an integer corresponding to the unbiased exponent of a single-precision floating-point number.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.
See LICENSE.
Copyright © 2016-2024. The Stdlib Authors.
0.2.0 (2024-02-14)
<section class="bug-fixes">a170482 - add missing fielda170482 - fix: add missing field (by Athan Reines)d575e8b - docs: update related packages sections (#1167) (by stdlib-bot)A total of 1 person contributed to this release. Thank you to this contributor:
FAQs
Return an integer corresponding to the unbiased exponent of a double-precision floating-point number.
The npm package @stdlib/number-float64-base-exponent receives a total of 385,898 weekly downloads. As such, @stdlib/number-float64-base-exponent popularity was classified as popular.
We found that @stdlib/number-float64-base-exponent demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
Did you know?
Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
Security News
Research
Socket researchers have discovered malicious npm packages targeting crypto developers, stealing credentials and wallet data using spyware delivered through typosquats of popular cryptographic libraries.
Security News
Socket's package search now displays weekly downloads for npm packages, helping developers quickly assess popularity and make more informed decisions.
Security News
A Stanford study reveals 9.5% of engineers contribute almost nothing, costing tech $90B annually, with remote work fueling the rise of "ghost engineers."