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@stdlib/number-float64-base-to-words
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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!
Split a double-precision floating-point number into a higher order word and a lower order word.
npm install @stdlib/number-float64-base-to-words
var toWords = require( '@stdlib/number-float64-base-to-words' );
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
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
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 ] );
}
#include "stdlib/number/float64/base/to_words.h"
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:
[in] double
input value.[out] uint32_t*
destination for higher order word.[out] uint32_t*
destination for lower order word.void stdlib_base_float64_to_words( const double x, uint32_t *high, uint32_t *low );
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:
uint32_t
higher order word.uint32_t
lower order word.#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 );
}
}
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 © 2016-2023. The Stdlib Authors.
FAQs
Split a double-precision floating-point number into a higher order word and a lower order word.
The npm package @stdlib/number-float64-base-to-words receives a total of 611,885 weekly downloads. As such, @stdlib/number-float64-base-to-words popularity was classified as popular.
We found that @stdlib/number-float64-base-to-words 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.
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