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Round a numeric value to the nearest multiple of 10^n toward zero.
To use in Observable,
truncn = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-truncn@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var truncn = require( 'path/to/vendor/umd/math-base-special-truncn/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-truncn@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.truncn;
})();
</script>Rounds a numeric value to the nearest multiple of 10^n toward zero.
// Round a value to 4 decimal places:
var v = truncn( 3.141592653589793, -4 );
// returns 3.1415
// If n = 0, `truncn` behaves like `trunc`:
v = truncn( 3.141592653589793, 0 );
// returns 3.0
// Round a value to the nearest thousand:
v = truncn( 12368.0, 3 );
// returns 12000.0- When operating on floating-point numbers in bases other than
2, rounding to specified digits can be inexact.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/math-base-special-truncn@umd/browser.js"></script>
<script type="text/javascript">
(function () {
var x;
var n;
var v;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
n = truncn( randu()*5.0, 0 );
v = truncn( x, -n );
console.log( 'x: %d. Number of decimals: %d. Rounded: %d.', x, n, v );
}
})();
</script>
</body>
</html>@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/roundn: round a double-precision floating-point number to the nearest multiple of 10^n.@stdlib/math-base/special/trunc: round a double-precision floating-point number toward zero.@stdlib/math-base/special/truncb: round a numeric value to the nearest multiple of b^n toward zero.
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.
See LICENSE.
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