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Circularly shift the elements of a strided array by a specified number of positions.
import gcircshift from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-ext-base-gcircshift@esm/index.mjs';You can also import the following named exports from the package:
import { ndarray } from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-ext-base-gcircshift@esm/index.mjs';Circularly shifts the elements of a strided array by a specified number of positions.
var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
gcircshift( x.length, 2, x, 1 );
// x => [ 4.0, 5.0, 1.0, 2.0, 3.0 ]The function has the following parameters:
- N: number of indexed elements.
- k: number of positions to shift.
- x: input array.
- strideX: stride length.
The N and stride parameters determine which elements in the strided array are accessed at runtime. For example, to circularly shift every other element:
var x = [ 1.0, 0.0, 2.0, 0.0, 3.0, 0.0, 4.0, 0.0 ];
gcircshift( 4, 1, x, 2 );
// x => [ 4.0, 0.0, 1.0, 0.0, 2.0, 0.0, 3.0, 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 array...
var x0 = new Float64Array( [ 0.0, 1.0, 2.0, 3.0, 4.0, 5.0 ] );
// Create an offset view...
var x1 = new Float64Array( x0.buffer, x0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
// Circularly shift elements in the view:
gcircshift( 5, 2, x1, 1 );
// x0 => <Float64Array>[ 0.0, 4.0, 5.0, 1.0, 2.0, 3.0 ]Circularly shifts the elements of a strided array by a specified number of positions using alternative indexing semantics.
var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
gcircshift.ndarray( x.length, 2, x, 1, 0 );
// x => [ 4.0, 5.0, 1.0, 2.0, 3.0 ]The function has the following additional parameters:
- offsetX: starting index.
While typed array views mandate a view offset based on the underlying buffer, the offset parameter supports indexing semantics based on a starting index. For example, to access only the last three elements of the strided array:
var x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
gcircshift.ndarray( 3, 1, x, 1, x.length-3 );
// x => [ 1.0, 2.0, 3.0, 6.0, 4.0, 5.0 ]- If
N <= 0, both functions return the strided array unchanged. - If
kis a multiple ofN, both functions return the strided array unchanged. - If
k > 0, elements are shifted to the right. - If
k < 0, elements are shifted to the left. - Depending on the environment, the typed versions (
dcircshift,scircshift, etc.) are likely to be significantly more performant.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="module">
import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-array-discrete-uniform@esm/index.mjs';
import gcircshift from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-ext-base-gcircshift@esm/index.mjs';
var x = discreteUniform( 10, -100, 100, {
'dtype': 'generic'
});
console.log( x );
gcircshift( x.length, 3, x, 1 );
console.log( x );
</script>
</body>
</html>This package is part of stdlib, a standard library 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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