@stdlib/math-base-special-truncsd
v0.3.0
Published
Round a numeric value to the nearest number toward zero with N significant figures.
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truncsd
Round a numeric value to the nearest number toward zero with
n
significant figures.
Installation
npm install @stdlib/math-base-special-truncsd
Usage
var truncsd = require( '@stdlib/math-base-special-truncsd' );
truncsd( x, n, b )
Rounds a numeric
value to the nearest number
toward zero with n
significant figures.
var v = truncsd( 3.141592653589793, 5, 10 );
// returns 3.1415
v = truncsd( 3.141592653589793, 1, 10 );
// returns 3.0
v = truncsd( 12368.0, 2, 10 );
// returns 12000.0
v = truncsd( 0.0313, 2, 2 );
// returns 0.03125
Examples
var randu = require( '@stdlib/random-base-randu' );
var truncsd = require( '@stdlib/math-base-special-truncsd' );
var x;
var y;
var i;
for ( i = 0; i < 100; i++ ) {
x = (randu()*10000.0) - 5000.0;
y = truncsd( x, 5, 10 );
console.log( 'x: %d. Rounded: %d.', x, y );
}
C APIs
Usage
#include "stdlib/math/base/special/truncsd.h"
stdlib_base_truncsd( x, n, b )
Rounds a numeric
value to the nearest number
toward negative infinity with n
significant figures.
double out = stdlib_base_truncsd( 3.141592653589793, 5, 10 );
// returns 3.1415
The function accepts the following arguments:
- x:
[in] double
input value. - n:
[in] int32_t
number of significant figures. - b:
[in] int32_t
base.
double stdlib_base_truncsd( const double x, const int32_t n, const int32_t b );
Examples
#include "stdlib/math/base/special/truncsd.h"
#include <stdio.h>
#include <stdint.h>
int main( void ) {
const double x[] = { -5.0, -3.89, -2.78, -1.67, -0.56, 0.56, 1.67, 2.78, 3.89, 5.0 };
const int32_t n[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
const int32_t b[] = { 20, 19, 18, 17, 16, 15, 14, 13, 12, 11 };
double v;
int i;
for ( i = 0; i < 10; i++ ) {
v = stdlib_base_truncsd( x[ i ], n[ i ], b[ i ] );
printf( "truncsd(%lf, %d, %d) = %lf\n", x[ i ], n[ i ], b[ i ], v );
}
}
See Also
@stdlib/math-base/special/ceilsd
: round a numeric value to the nearest number toward positive infinity with N significant figures.@stdlib/math-base/special/floorsd
: round a numeric value to the nearest number toward negative infinity with N significant figures.@stdlib/math-base/special/roundsd
: round a numeric value to the nearest number with N significant figures.@stdlib/math-base/special/trunc
: round a double-precision floating-point number 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.