npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

@stdlib/number-float64-base-to-words

v0.2.2

Published

Split a double-precision floating-point number into a higher order word and a lower order word.

Downloads

1,741,807

Readme

Words

NPM version Build Status Coverage Status

Split a double-precision floating-point number into a higher order word and a lower order word.

Installation

npm install @stdlib/number-float64-base-to-words

Usage

var toWords = require( '@stdlib/number-float64-base-to-words' );

toWords( x )

Splits a double-precision floating-point number into a higher order word (unsigned 32-bit integer) and a lower order word (unsigned 32-bit integer).

var w = toWords( 3.14e201 );
// returns [ 1774486211, 2479577218 ]

By default, the function returns an array containing two elements: a higher order word and a lower order word. The lower order word contains the less significant bits, while the higher order word contains the more significant bits and includes the exponent and sign.

var w = toWords( 3.14e201 );
// returns [ 1774486211, 2479577218 ]

var high = w[ 0 ];
// returns 1774486211

var low = w[ 1 ];
// returns 2479577218

toWords.assign( x, out, stride, offset )

Splits a double-precision floating-point number into a higher order word (unsigned 32-bit integer) and a lower order word (unsigned 32-bit integer) and assigns results to a provided output array.

var Uint32Array = require( '@stdlib/array-uint32' );

var out = new Uint32Array( 2 );

var w = toWords.assign( 3.14e201, out, 1, 0 );
// returns <Uint32Array>[ 1774486211, 2479577218 ]

var bool = ( w === out );
// returns true

Examples

var floor = require( '@stdlib/math-base-special-floor' );
var randu = require( '@stdlib/random-base-randu' );
var pow = require( '@stdlib/math-base-special-pow' );
var toWords = require( '@stdlib/number-float64-base-to-words' );

var frac;
var exp;
var w;
var x;
var i;

// Generate random numbers and split into words...
for ( i = 0; i < 100; i++ ) {
    frac = randu() * 10.0;
    exp = -floor( randu()*324.0 );
    x = frac * pow( 10.0, exp );
    w = toWords( x );
    console.log( 'x: %d. higher: %d. lower: %d.', x, w[ 0 ], w[ 1 ] );
}

C APIs

Usage

#include "stdlib/number/float64/base/to_words.h"

stdlib_base_float64_to_words( x, *high, *low )

Splits a double-precision floating-point number into a higher order word and a lower order word.

#include <stdint.h>

uint32_t high;
uint32_t low;

stdlib_base_float64_to_words( 3.14, &high, &low );

The function accepts the following arguments:

  • x: [in] double input value.
  • high: [out] uint32_t* destination for higher order word.
  • low: [out] uint32_t* destination for lower order word.
void stdlib_base_float64_to_words( const double x, uint32_t *high, uint32_t *low );

stdlib_base_float64_words_t

An opaque type definition for a union for converting between a double-precision floating-point number and two unsigned 32-bit integers.

#include <stdint.h>

stdlib_base_float64_words_t w;

// Assign a double-precision floating-point number:
w.value = 3.14;

// Extract the high and low words:
uint32_t high = w.words.high;
uint32_t low = w.words.low;

The union has the following members:

  • value: double double-precision floating-point number.

  • words: struct struct having the following members:

    • high: uint32_t higher order word.
    • low: uint32_t lower order word.

Examples

#include "stdlib/number/float64/base/to_words.h"
#include <stdint.h>
#include <stdio.h>

int main( void ) {
    double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };

    uint32_t high;
    uint32_t low;
    int i;
    for ( i = 0; i < 4; i++ ) {
        stdlib_base_float64_to_words( x[ i ], &high, &low );
        printf( "%lf => high: %u, low: %u\n", x[ i ], high, low );
    }
}

See Also


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

Chat


License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.