toFloat16

Convert a double-precision floating-point number to the nearest half-precision floating-point number.

Installation

npm install @stdlib/number-float64-base-to-float16

Usage

var float64ToFloat16 = require( '@stdlib/number-float64-base-to-float16' );

float64ToFloat16( x )

Converts a double-precision floating-point number to the nearest half-precision floating-point number.

var y = float64ToFloat16( 1.337 );
// returns 1.3369140625

Notes

• This function may be used as a polyfill for the ES2025 built-in Math.f16round.

Examples

var uniform = require( '@stdlib/random-array-uniform' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var float64ToFloat16 = require( '@stdlib/number-float64-base-to-float16' );

// Generate an array of random numbers:
var x = uniform( 100, 0.0, 100.0 );

// Convert each double-precision floating-point number to the nearest half-precision floating-point number:
logEachMap( 'float64: %f => float16: %f', x, float64ToFloat16 );

C APIs

Usage

#include "stdlib/number/float64/base/to_float16.h"

stdlib_base_float64_to_float16( x )

Converts a double-precision floating-point number to the nearest half-precision floating-point number.

#include "stdlib/number/float16/ctor.h"

stdlib_float16_t x = stdlib_base_float64_to_float16( 3.14 );

The function accepts the following arguments:

• x: [in] double input value.

stdlib_float16_t stdlib_base_float64_to_float16( const double x );

Examples

#include "stdlib/number/float64/base/to_float16.h"
#include "stdlib/number/float16/ctor.h"
#include <stdint.h>
#include <stdio.h>

int main( void ) {
    const double x[] = { 3.14, -3.14, 0.0, 0.0/0.0 };

    stdlib_float16_t v;
    int i;
    for ( i = 0; i < 4; i++ ) {
        v = stdlib_base_float64_to_float16( x[ i ] );
        printf( "%lf => uint16: %d\n", x[ i ], stdlib_float16_to_bits( v ) );
    }
}

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 © 2016-2026. The Stdlib Authors.