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Round each element in a strided array toward zero.
To use in Observable,
trunc = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/math-strided-special-trunc@umd/browser.js' )
To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var trunc = require( 'path/to/vendor/umd/math-strided-special-trunc/index.js' )
To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/math-strided-special-trunc@umd/browser.js"></script>
If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.trunc;
})();
</script>
Rounds each element in a strided array x
toward zero and assigns the results to elements in a strided array y
.
var Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 1.1, 2.5, -3.5, 4.0, -5.9 ] );
// Perform operation in-place:
trunc( x.length, 'float64', x, 1, 'float64', x, 1 );
// x => <Float64Array>[ 1.0, 2.0, -3.0, 4.0, -5.0 ]
The function accepts the following arguments:
- N: number of indexed elements.
- dtypeX: data type for
x
. - x: input array-like object.
- strideX: index increment for
x
. - dtypeY: data type for
y
. - y: output array-like object.
- strideY: index increment for
y
.
The N
and stride
parameters determine which elements in x
and y
are accessed at runtime. For example, to index every other value in x
and the first N
elements of y
in reverse order,
var Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 1.1, 2.5, -3.5, 4.0, -5.9, 6.4 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
trunc( 3, 'float64', x, 2, 'float64', y, -1 );
// y => <Float64Array>[ -5.0, -3.0, 1.0, 0.0, 0.0, 0.0 ]
Note that indexing is relative to the first index. To introduce an offset, use typed array
views.
var Float64Array = require( '@stdlib/array-float64' );
// Initial arrays...
var x0 = new Float64Array( [ 1.1, 2.5, -3.5, 4.0, -5.9, 6.4 ] );
var y0 = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
// Create offset views...
var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
var y1 = new Float64Array( y0.buffer, y0.BYTES_PER_ELEMENT*3 ); // start at 4th element
trunc( 3, 'float64', x1, -2, 'float64', y1, 1 );
// y0 => <Float64Array>[ 0.0, 0.0, 0.0, 6.0, 4.0, 2.0 ]
Rounds each element in a strided array x
toward zero and assigns the results to elements in a strided array y
using alternative indexing semantics.
var Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 1.1, 2.5, -3.5, 4.0, -5.9 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0 ] );
trunc.ndarray( x.length, 'float64', x, 1, 0, 'float64', y, 1, 0 );
// y => <Float64Array>[ 1.0, 2.0, -3.0, 4.0, -5.0 ]
The function accepts the following additional arguments:
- offsetX: starting index for
x
. - offsetY: starting index for
y
.
While typed array
views mandate a view offset based on the underlying buffer
, the offsetX
and offsetY
parameters support indexing semantics based on starting indices. For example, to index every other value in x
starting from the second value and to index the last N
elements in y
,
var Float64Array = require( '@stdlib/array-float64' );
var x = new Float64Array( [ 1.1, 2.5, -3.5, 4.0, -5.9, 6.4 ] );
var y = new Float64Array( [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ] );
trunc.ndarray( 3, 'float64', x, 2, 1, 'float64', y, -1, y.length-1 );
// y => <Float64Array>[ 0.0, 0.0, 0.0, 6.0, 4.0, 2.0 ]
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/random-base-uniform@umd/browser.js"></script>
<script type="text/javascript">
(function () {.factory;
var filledarray = require( '@stdlib/array-filled' );
var filledarrayBy = require( '@stdlib/array-filled-by' );
var dtypes = require( '@stdlib/array-typed-real-float-dtypes' );
var trunc = require( '@stdlib/math-strided-special-trunc' );
var dt;
var x;
var y;
var i;
dt = dtypes();
for ( i = 0; i < dt.length; i++ ) {
x = filledarrayBy( 10, dt[ i ], uniform( -100.0, 100.0 ) );
console.log( x );
y = filledarray( 0.0, x.length, 'generic' );
console.log( y );
trunc.ndarray( x.length, dt[ i ], x, 1, 0, 'generic', y, -1, y.length-1 );
console.log( y );
console.log( '' );
}
})();
</script>
</body>
</html>
@stdlib/math-strided/special/ceil
: round each element in a strided array toward positive infinity.@stdlib/math-strided/special/dtrunc
: round each element in a double-precision floating-point strided array toward zero.@stdlib/math-strided/special/floor
: round each element in a strided array toward negative infinity.@stdlib/math-strided/special/strunc
: round each element in a single-precision floating-point strided array 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.
Copyright © 2016-2024. The Stdlib Authors.