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Round a double-precision floating-point number to the nearest multiple of 10^n.
import roundn from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-roundn@deno/mod.js';Rounds a double-precision floating-point number to the nearest multiple of 10^n.
// Round a value to 2 decimal places:
var v = roundn( 3.141592653589793, -2 );
// returns 3.14
// If n = 0, `roundn` behaves like `round`:
v = roundn( 3.141592653589793, 0 );
// returns 3.0
// Round a value to the nearest thousand:
v = roundn( 12368.0, 3 );
// returns 12000.0-
When operating on floating-point numbers in bases other than
2, rounding to specified digits can be inexact. For example,var x = 0.2 + 0.1; // returns 0.30000000000000004 // Should round to 0.3... var v = roundn( x, -16 ); // returns 0.3000000000000001
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@deno/mod.js';
import roundn from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-roundn@deno/mod.js';
var x;
var n;
var v;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
n = roundn( randu()*5.0, 0 );
v = roundn( x, -n );
console.log( 'x: %d. Number of decimals: %d. Rounded: %d.', x, n, v );
}@stdlib/math-base/special/ceiln: round a numeric value to the nearest multiple of 10^n toward positive infinity.@stdlib/math-base/special/floorn: round a double-precision floating-point number to the nearest multiple of 10^n toward negative infinity.@stdlib/math-base/special/round: round a numeric value to the nearest integer.@stdlib/math-base/special/roundb: round a numeric value to the nearest multiple of b^n on a linear scale.
This package is part of stdlib, a standard library 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.
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