ceil2

Round a numeric value to the nearest power of two toward positive infinity.

Installation

npm install @stdlib/math-base-special-ceil2

Usage

var ceil2 = require( '@stdlib/math-base-special-ceil2' );

ceil2( x )

Rounds a numeric value to the nearest power of two toward positive infinity.

var v = ceil2( -4.2 );
// returns -4.0

v = ceil2( -4.5 );
// returns -4.0

v = ceil2( -4.6 );
// returns -4.0

v = ceil2( 9.99999 );
// returns 16.0

v = ceil2( 9.5 );
// returns 16.0

v = ceil2( 13.0 );
// returns 16.0

v = ceil2( -13.0 );
// returns -8.0

v = ceil2( 0.0 );
// returns 0.0

v = ceil2( -0.0 );
// returns -0.0

v = ceil2( Infinity );
// returns Infinity

v = ceil2( -Infinity );
// returns -Infinity

v = ceil2( NaN );
// returns NaN

Examples

var randu = require( '@stdlib/random-base-randu' );
var ceil2 = require( '@stdlib/math-base-special-ceil2' );

var x;
var v;
var i;

for ( i = 0; i < 100; i++ ) {
    x = (randu()*100.0) - 50.0;
    v = ceil2( x );
    console.log( 'Value: %d. Rounded: %d.', x, v );
}

C APIs

Usage

#include "stdlib/math/base/special/ceil2.h"

stdlib_base_ceil2( x )

Rounds a numeric value to the nearest power of two toward positive infinity.

double y = stdlib_base_ceil2( 3.14 );
// returns 4.0

The function accepts the following arguments:

• x: [in] double input value.

double stdlib_base_ceil2( const double x );

Examples

#include "stdlib/math/base/special/ceil2.h"
#include <stdio.h>

int main( void ) {
    const double x[] = { 3.14, -3.14, 0.5, 0.0 / 0.0 };

    double y;
    int i;
    for ( i = 0; i < 4; i++ ) {
        y = stdlib_base_ceil2( x[ i ] );
        printf( "ceil2(%lf) = %lf\n", x[ i ], y );
    }
}

See Also

• @stdlib/math-base/special/ceil: round a double-precision floating-point number toward positive infinity.
• @stdlib/math-base/special/ceil10: round a numeric value to the nearest power of 10 toward positive infinity.
• @stdlib/math-base/special/floor2: round a numeric value to the nearest power of two toward negative infinity.
• @stdlib/math-base/special/round2: round a numeric value to the nearest power of two on a linear scale.

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.