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Copy values from
x
intoy
.
import gcopy from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-base-gcopy@deno/mod.js';
You can also import the following named exports from the package:
import { ndarray } from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-base-gcopy@deno/mod.js';
Copies values from x
into y
.
var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
var y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
gcopy( x.length, x, 1, y, 1 );
// y => [ 1.0, 2.0, 3.0, 4.0, 5.0 ]
The function has the following parameters:
- N: number of indexed elements.
- x: input array.
- strideX: index increment for
x
. - y: output array.
- strideY: index increment for
y
.
The N
and stride parameters determine how values from x
are copied into y
. For example, to copy in reverse order every other value in x
into the first N
elements of y
,
var x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var y = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
gcopy( 3, x, -2, y, 1 );
// y => [ 5.0, 3.0, 1.0, 10.0, 11.0, 12.0 ]
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@deno/mod.js';
// Initial arrays...
var x0 = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
var y0 = new Float64Array( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
// 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
// Copy in reverse order every other value from `x1` into `y1`...
gcopy( 3, x1, -2, y1, 1 );
// y0 => <Float64Array>[ 7.0, 8.0, 9.0, 6.0, 4.0, 2.0 ]
Copies values from x
into y
using alternative indexing semantics.
var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
var y = [ 6.0, 7.0, 8.0, 9.0, 10.0 ];
gcopy.ndarray( x.length, x, 1, 0, y, 1, 0 );
// y => [ 1.0, 2.0, 3.0, 4.0, 5.0 ]
The function has the following additional parameters:
- offsetX: starting index for
x
. - offsetY: starting index for
y
.
While typed array
views mandate a view offset based on the underlying buffer, the offset parameters support indexing semantics based on starting indices. For example, to copy every other value in x
starting from the second value into the last N
elements in y
where x[i] = y[n]
, x[i+2] = y[n-1]
,...,
var x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var y = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
gcopy.ndarray( 3, x, 2, 1, y, -1, y.length-1 );
// y => [ 7.0, 8.0, 9.0, 6.0, 4.0, 2.0 ]
- If
N <= 0
, both functions returny
unchanged. - Both functions support array-like objects having getter and setter accessors for array element access (e.g.,
@stdlib/array-complex64
). gcopy()
corresponds to the BLAS level 1 functiondcopy
with the exception that this implementation works with any array type, not just Float64Arrays. Depending on the environment, the typed versions (dcopy
,scopy
, etc.) are likely to be significantly more performant.
import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-array-discrete-uniform@deno/mod.js';
import gcopy from 'https://cdn.jsdelivr.net/gh/stdlib-js/blas-base-gcopy@deno/mod.js';
var opts = {
'dtype': 'float64'
};
var x = discreteUniform( 10, 0, 500, opts );
console.log( x );
var y = discreteUniform( x.length, 0, 255, opts );
console.log( y );
// Copy elements from `x` into `y` starting from the end of `y`:
gcopy( x.length, x, 1, y, -1 );
console.log( y );
@stdlib/blas-base/dcopy
: copy values from x into y.@stdlib/blas-base/scopy
: copy values from x into y.
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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