@stdlib/math-base-special-trunc10
v0.3.0
Published
Round a numeric value to the nearest power of 10 toward zero.
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trunc10
Round a numeric value to the nearest power of 10 toward zero.
Installation
npm install @stdlib/math-base-special-trunc10
Usage
var trunc10 = require( '@stdlib/math-base-special-trunc10' );
trunc10( x )
Rounds a numeric
value to the nearest power of 10 toward zero.
var v = trunc10( -4.2 );
// returns -1.0
v = trunc10( -4.5 );
// returns -1.0
v = trunc10( -4.6 );
// returns -1.0
v = trunc10( 9.99999 );
// returns 1.0
v = trunc10( 9.5 );
// returns 1.0
v = trunc10( 13.0 );
// returns 10.0
v = trunc10( -13.0 );
// returns -10.0
v = trunc10( 0.0 );
// returns 0.0
v = trunc10( -0.0 );
// returns -0.0
v = trunc10( Infinity );
// returns Infinity
v = trunc10( -Infinity );
// returns -Infinity
v = trunc10( NaN );
// returns NaN
Notes
The function may not return accurate results for subnormals due to a general loss in precision.
var v = trunc10( 1.0e-323 ); // should return 1.0e-323 // returns 0.0
Examples
var randu = require( '@stdlib/random-base-randu' );
var trunc10 = require( '@stdlib/math-base-special-trunc10' );
var x;
var v;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*100.0) - 50.0;
v = trunc10( x );
console.log( 'Value: %d. Rounded: %d.', x, v );
}
C APIs
Usage
#include "stdlib/math/base/special/trunc10.h"
stdlib_base_trunc10( x )
Rounds a numeric
value to the nearest power of 10 toward zero.
double y = stdlib_base_trunc10( -4.2 );
// returns -1.0
The function accepts the following arguments:
- x:
[in] double
input value.
double stdlib_base_trunc10( const double x );
Examples
#include "stdlib/math/base/special/trunc10.h"
#include <stdio.h>
int main( void ) {
const double x[] = { 3.14, -3.14, 0.0, 0.0 / 0.0 };
double y;
int i;
for ( i = 0; i < 4; i++ ) {
y = stdlib_base_trunc10( x[ i ] );
printf( "trunc10(%lf) = %lf\n", x[ i ], y );
}
}
See Also
@stdlib/math-base/special/ceil10
: round a numeric value to the nearest power of 10 toward positive infinity.@stdlib/math-base/special/floor10
: round a numeric value to the nearest power of 10 toward negative infinity.@stdlib/math-base/special/round10
: round a numeric value to the nearest power of 10 on a linear scale.@stdlib/math-base/special/trunc
: round a double-precision floating-point number toward zero.@stdlib/math-base/special/trunc2
: round a numeric value to the nearest power of two toward zero.
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.