stdlib-js
<summary>
About stdlib...
</summary>
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!
High Word
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Return an unsigned 32-bit integer corresponding to the more significant 32 bits of a [double-precision floating-point number][ieee754].
bash
npm install @stdlib/number-float64-base-get-high-word
javascript
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][ieee754].
javascript
var w = getHighWord( 3.14e201 ); // => 01101001110001001000001011000011
// returns 1774486211
javascript
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
#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.
c
#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.
c
void stdlib_base_float64_get_high_word( const double x, uint32_t *high );
c
#include "stdlib/number/float64/base/get_high_word.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;
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 );
}
}
@stdlib/number-float64/base/get-low-word][@stdlib/number/float64/base/get-low-word]: return an unsigned 32-bit integer corresponding to the less significant 32 bits of a double-precision floating-point number.
- [@stdlib/number-float64/base/set-high-word][@stdlib/number/float64/base/set-high-word]: set the more significant 32 bits of a double-precision floating-point number.
