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@stdlib/math-base-special-modf 0.0.5 • Public • Published

modf

Decompose a double-precision floating-point number into integral and fractional parts.

Installation

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

Usage

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

modf( [out,] x )

Decomposes a double-precision floating-point number into integral and fractional parts, each having the same type and sign as x.

var parts = modf( 3.14 );
// returns [ 3.0, 0.14000000000000012 ]

parts = modf( +0.0 );
// returns [ +0.0, +0.0 ]

parts = modf( -0.0 );
// returns [ -0.0, -0.0 ]

parts = modf( Infinity );
// returns [ Infinity, +0.0 ]

parts = modf( -Infinity );
// returns [ -Infinity, -0.0 ]

parts = modf( NaN );
// returns [ NaN, NaN ]

To avoid unnecessary memory allocation, the function supports providing an output (destination) object.

var Float64Array = require( '@stdlib/array-float64' );

var out = new Float64Array( 2 );

var parts = modf( out, 3.14 );
// returns <Float64Array>[ 3.0, 0.14000000000000012 ]

var bool = ( parts === out );
// returns true

Examples

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

var parts;
var x;
var i;

for ( i = 0; i < 100; i++ ) {
x = (randu()*1000.0) - 500.0;
parts = modf( x );
console.log( 'modf(%d) => integral: %d. fraction: %d.', x, parts[ 0 ], parts[ 1 ] );
}

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 