Convert a half-precision floating-point number to the nearest double-precision floating-point number.
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> Convert a [half-precision floating-point number][half-precision-floating-point-format] to the nearest [double-precision floating-point number][ieee754].
``bash`
npm install @stdlib/number-float16-base-to-float64
`javascript`
var float16ToFloat64 = require( '@stdlib/number-float16-base-to-float64' );
#### float16ToFloat64( x )
Converts a [half-precision floating-point number][half-precision-floating-point-format] to the nearest [double-precision floating-point number][ieee754].
`javascript
var float64ToFloat16 = require( '@stdlib/number-float64-base-to-float16' );
var y = float16ToFloat64( float64ToFloat16( 1.337 ) );
// returns 1.3369140625
`
`javascript
var float64ToFloat16 = require( '@stdlib/number-float64-base-to-float16' );
var uniform = require( '@stdlib/random-array-uniform' );
var map = require( '@stdlib/array-base-map' );
var naryFunction = require( '@stdlib/utils-nary-function' );
var pickArguments = require( '@stdlib/utils-pick-arguments' );
var logEachMap = require( '@stdlib/console-log-each-map' );
var float16ToFloat64 = require( '@stdlib/number-float16-base-to-float64' );
// Generate an array of random numbers:
var f64 = uniform( 100, 0.0, 100.0 );
// Convert each value to a half-precision floating-point number:
var f16 = map( f64, naryFunction( float64ToFloat16, 1 ) );
// Convert each half-precision floating-point number to the nearest double-precision floating-point number:
logEachMap( 'float64: %f => float16: %f => float64: %f', f64, f16, pickArguments( float16ToFloat64, [ 1 ] ) );
`
*
`c`
#include "stdlib/number/float16/base/to_float64.h"
#### stdlib_base_float16_to_float64( x )
Converts a [half-precision floating-point number][half-precision-floating-point-format] to the nearest [double-precision floating-point number][ieee754].
`c
#include "stdlib/number/float16/ctor.h"
stdlib_float16_t v = stdlib_float16_from_bits( 51648 ); // => -11.5
double x = stdlib_base_float16_to_float64( v );
`
The function accepts the following arguments:
- x: [in] stdlib_float16_t half-precision floating-point number.
`c`
double stdlib_base_float16_to_float64( const stdlib_float16_t x );
`c
#include "stdlib/number/float16/base/to_float64.h"
#include "stdlib/number/float16/ctor.h"
#include
#include
int main( void ) {
const stdlib_float16_t x[] = {
stdlib_float16_from_bits( 51648 ), // -11.5
stdlib_float16_from_bits( 18880 ) // 11.5
};
double v;
int i;
for ( i = 0; i < 2; i++ ) {
v = stdlib_base_float16_to_float64( x[ i ] );
printf( "float16 bits: %u => float64: %lf\n", stdlib_float16_to_bits( x[ i ] ), v );
}
}
`
*
This package is part of [stdlib][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][stdlib], see the main project [repository][stdlib].
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---
See [LICENSE][stdlib-license].
Copyright © 2016-2026. The Stdlib [Authors][stdlib-authors].
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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules
[deno-url]: https://github.com/stdlib-js/number-float16-base-to-float64/tree/deno
[deno-readme]: https://github.com/stdlib-js/number-float16-base-to-float64/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/number-float16-base-to-float64/tree/umd
[umd-readme]: https://github.com/stdlib-js/number-float16-base-to-float64/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/number-float16-base-to-float64/tree/esm
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[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/number-float16-base-to-float64/main/LICENSE
[ieee754]: https://en.wikipedia.org/wiki/IEEE_754-1985
[half-precision-floating-point-format]: https://en.wikipedia.org/wiki/Half-precision_floating-point_format