What is @stdlib/number-float64-base-to-words?
@stdlib/number-float64-base-to-words is a utility package that provides functionality to convert a 64-bit floating-point number to its IEEE 754 binary representation. This can be useful for low-level bitwise operations, debugging, and understanding the internal representation of floating-point numbers.
What are @stdlib/number-float64-base-to-words's main functionalities?
Convert Float64 to Words
This feature allows you to convert a 64-bit floating-point number to its IEEE 754 binary representation. The function returns an array containing two 32-bit integers representing the higher and lower order words of the floating-point number.
const toWords = require('@stdlib/number-float64-base-to-words');
const words = toWords(3.14);
console.log(words);
Other packages similar to @stdlib/number-float64-base-to-words
ieee754
The 'ieee754' package provides functions to read and write IEEE 754 floating-point numbers. It is more general-purpose and can handle both 32-bit and 64-bit floating-point numbers. Unlike @stdlib/number-float64-base-to-words, it focuses on encoding and decoding rather than just conversion to words.
Words
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( [out,] 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 );
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 );
var high = w[ 0 ];
var low = w[ 1 ];
To avoid unnecessary memory allocation, the function supports providing an output (destination) object.
var Uint32Array = require( '@stdlib/array-uint32' );
var out = new Uint32Array( 2 );
var w = toWords( out, 3.14e201 );
var bool = ( w === out );
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;
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
Installation
npm install @stdlib/number-float64-base-to-words
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;
w.value = 3.14;
uint32_t high = w.words.high;
uint32_t low = w.words.low;
The union has the following members:
Examples
#include "stdlib/number/float64/base/to_words.h"
#include <stdint.h>
#include <stdio.h>
int main() {
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 );
}
}
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.
License
See LICENSE.
Copyright
Copyright © 2016-2021. The Stdlib Authors.
0.0.3 (2021-06-27)
No changes reported for this release.
</section>
<!-- /.release -->
<section class="release" id="v0.0.2">