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Set the more significant 32 bits of a double-precision floating-point number.
import setHighWord from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-set-high-word@esm/index.mjs';Sets the more significant 32 bits (higher order word) of a double-precision floating-point number x to a bit sequence represented by an unsigned 32-bit integer high. The returned double will have the same less significant 32 bits (lower order word) as x.
var high = 5 >>> 0; // => 0 00000000000 00000000000000000101
var y = setHighWord( 3.14e201, high ); // => 0 00000000000 0000000000000000010110010011110010110101100010000010
// returns 1.18350528745e-313
import PINF from 'https://cdn.jsdelivr.net/gh/stdlib-js/constants-float64-pinf@esm/index.mjs'; // => 0 11111111111 00000000000000000000 00000000000000000000000000000000
high = 1072693248 >>> 0; // => 0 01111111111 00000000000000000000
// Set the higher order bits of `+infinity` to return `1`:
y = setHighWord( PINF, high ); // => 0 01111111111 0000000000000000000000000000000000000000000000000000
// returns 1.0<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import pow from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-pow@esm/index.mjs';
import round from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-round@esm/index.mjs';
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@esm/index.mjs';
import MAX_UINT32 from 'https://cdn.jsdelivr.net/gh/stdlib-js/constants-uint32-max@esm/index.mjs';
import setHighWord from 'https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-set-high-word@esm/index.mjs';
var high;
var frac;
var exp;
var x;
var y;
var i;
// Generate a random double-precision floating-point number:
frac = randu() * 10.0;
exp = -round( randu() * 323.0 );
x = frac * pow( 10.0, exp );
// Replace the higher order word of `x` to generate new random numbers having the same lower order word...
for ( i = 0; i < 100; i++ ) {
high = round( randu()*MAX_UINT32 );
y = setHighWord( x, high );
console.log( 'x: %d. new high word: %d. y: %d.', x, high, y );
}
</script>
</body>
</html>@stdlib/number-float64/base/get-high-word: return an unsigned 32-bit integer corresponding to the more significant 32 bits of a double-precision floating-point number.@stdlib/number-float64/base/set-low-word: set the less significant 32 bits of a double-precision floating-point number.
This package is part of stdlib, a standard library 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.
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