What is @stdlib/number-float64-base-get-high-word?
The @stdlib/number-float64-base-get-high-word package provides a utility to extract the higher order word (most significant 32 bits) from a double-precision floating-point number (64-bit). This can be useful for low-level bit manipulation and analysis of floating-point numbers.
What are @stdlib/number-float64-base-get-high-word's main functionalities?
Extract High Word
This feature allows you to extract the high word from a given double-precision floating-point number. The high word is the most significant 32 bits of the 64-bit floating-point number.
const getHighWord = require('@stdlib/number-float64-base-get-high-word');
const highWord = getHighWord(3.14);
console.log(highWord); // Output will be the high word of the float64 number 3.14
Other packages similar to @stdlib/number-float64-base-get-high-word
bit-twiddle
The bit-twiddle package provides a variety of bit manipulation utilities, including functions to extract specific bits, set bits, and perform other low-level operations. While it offers a broader range of bit manipulation functions, it does not specifically focus on extracting the high word from a float64 number like @stdlib/number-float64-base-get-high-word.
High Word
Return an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.
Installation
npm install @stdlib/number-float64-base-get-high-word
Usage
var getHighWord = require( '@stdlib/number-float64-base-get-high-word' );
getHighWord( x )
Returns an unsigned 32-bit integer
corresponding to the more significant 32 bits of a double-precision floating-point number.
var w = getHighWord( 3.14e201 );
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 getHighWord = require( '@stdlib/number-float64-base-get-high-word' );
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 = getHighWord( x );
console.log( 'x: %d. high word: %d.', x, w );
}
C APIs
Installation
npm install @stdlib/number-float64-base-get-high-word
Usage
#include "stdlib/number/float64/base/get_high_word.h"
stdlib_base_float64_get_high_word( x, *high )
Extracts the unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.
#include <stdint.h>
uint32_t high;
stdlib_base_float64_get_high_word( 3.14, &high );
The function accepts the following arguments:
- x:
[in] double
input value. - high:
[out] uint32_t*
destination for higher order word.
void stdlib_base_float64_get_high_word( const double x, uint32_t *high );
Examples
#include "stdlib/number/float64/base/get_high_word.h"
#include <stdint.h>
#include <stdio.h>
int main() {
double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };
uint32_t high;
int i;
for ( i = 0; i < 4; i++ ) {
stdlib_base_float64_get_high_word( x[ i ], &high );
printf( "%lf => high: %u\n", x[ i ], high );
}
}
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.
0.0.2 (2021-06-16)
No changes reported for this release.
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