stdlib-js/number-float32-base-from-word

Create a single-precision floating-point number from an unsigned integer corresponding to an IEEE 754 binary representation.

About stdlib...

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!

fromWordf

Create a single-precision floating-point number from an unsigned integer corresponding to an IEEE 754 binary representation.

Installation

npm install @stdlib/number-float32-base-from-word

Alternatively,

• To load the package in a website via a script tag without installation and bundlers, use the ES Module available on the esm branch (see README).
• If you are using Deno, visit the deno branch (see README for usage intructions).
• For use in Observable, or in browser/node environments, use the Universal Module Definition (UMD) build available on the umd branch (see README).

The branches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

var fromWordf = require( '@stdlib/number-float32-base-from-word' );

fromWordf( word )

Creates a single-precision floating-point number from an unsigned integer corresponding to an IEEE 754 binary representation.

var word = 1068180177; // => 0 01111111 01010110010001011010001

var f32 = fromWordf( word ); // when printed, implicitly promoted to float64
// returns 1.3370000123977661

Notes

• The equivalent of this function in C/C++,

  float fromWordf(unsigned int x) {
    return *(float*)&x;
  }

Examples

var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var MAX_UINT32 = require( '@stdlib/constants-uint32-max' );
var fromWordf = require( '@stdlib/number-float32-base-from-word' );

var word;
var f32;
var i;

// Create single-precision floating-point numbers from unsigned integers...
for ( i = 0; i < 1000; i++ ) {
    word = round( randu()*MAX_UINT32 );
    f32 = fromWordf( word );
    console.log( 'word: %d => float32: %d', word, f32 );
}

---

C APIs

Usage

#include "stdlib/number/float32/base/from_word.h"

stdlib_base_float32_from_word( word, *x )

Creates a single-precision floating-point number from an unsigned 32-bit integer corresponding to an IEEE 754 binary representation.

#include <stdint.h>

uint32_t word = 1078523331;

float x;
stdlib_base_float32_from_word( word, &x );

The function accepts the following arguments:

• word: [in] uint32_t input word.
• x: [out] float* destination for a single-precision floating-point number.

void stdlib_base_float32_from_word( const uint32_t word, float *x );

Examples

#include "stdlib/number/float32/base/from_word.h"
#include <stdint.h>
#include <stdio.h>

int main( void ) {
    uint32_t word = 1078523331;

    float x;
    int i;
    for ( i = 0; i < 10; i++ ) {
        stdlib_base_float32_from_word( word+(uint32_t)(i*10), &x );
        printf( "word: %u => %f\n", word, x );
    }
}

---

See Also

• @stdlib/number-float64/base/from-words: create a double-precision floating-point number from a higher order word and a lower order word.

---

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.

Community

---

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.