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Round each element in a double-precision floating-point strided array toward positive infinity.
import dceil from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-strided-special-dceil@esm/index.mjs';
Rounds each element in a double-precision floating-point strided array x
toward positive infinity and assigns the results to elements in a double-precision floating-point strided array y
.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
var x = new Float64Array( [ 1.1, 2.5, -3.5, 4.0, -5.9 ] );
// Perform operation in-place:
dceil( x.length, x, 1, x, 1 );
// x => <Float64Array>[ 2.0, 3.0, -3.0, 4.0, -5.0 ]
The function accepts the following arguments:
- N: number of indexed elements.
- x: input
Float64Array
. - strideX: index increment for
x
. - y: output
Float64Array
. - 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 to index the first N
elements of y
in reverse order,
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
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 ] );
dceil( 3, x, 2, y, -1 );
// y => <Float64Array>[ -5.0, -3.0, 2.0, 0.0, 0.0, 0.0 ]
Note that indexing is relative to the first index. To introduce an offset, use typed array
views.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
// 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
dceil( 3, x1, -2, y1, 1 );
// y0 => <Float64Array>[ 0.0, 0.0, 0.0, 7.0, 4.0, 3.0 ]
Rounds each element in a double-precision floating-point strided array x
toward positive infinity and assigns the results to elements in a double-precision floating-point strided array y
using alternative indexing semantics.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
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 ] );
dceil.ndarray( x.length, x, 1, 0, y, 1, 0 );
// y => <Float64Array>[ 2.0, 3.0, -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
,
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
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 ] );
dceil.ndarray( 3, x, 2, 1, y, -1, y.length-1 );
// y => <Float64Array>[ 0.0, 0.0, 0.0, 7.0, 4.0, 3.0 ]
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import uniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-uniform@esm/index.mjs';
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@esm/index.mjs';
import dceil from 'https://cdn.jsdelivr.net/gh/stdlib-js/math-strided-special-dceil@esm/index.mjs';
var x = new Float64Array( 10 );
var y = new Float64Array( 10 );
var i;
for ( i = 0; i < x.length; i++ ) {
x[ i ] = uniform( -10.0, 10.0 );
}
console.log( x );
console.log( y );
dceil.ndarray( x.length, x, 1, 0, y, -1, y.length-1 );
console.log( y );
</script>
</body>
</html>
@stdlib/math-strided/special/ceil
: round each element in a strided array toward positive infinity.@stdlib/math-strided/special/dfloor
: round each element in a double-precision floating-point strided array toward negative infinity.@stdlib/math-strided/special/dtrunc
: round each element in a double-precision floating-point strided array toward zero.@stdlib/math-strided/special/sceil
: round each element in a single-precision floating-point strided array toward positive infinity.
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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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