blas-dcopy
v1.0.1
Published
Copies values from x into y.
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dcopy
Copies elements from
x
intoy
.
Installation
$ npm install blas-dcopy
Usage
var copy = require( 'blas-dcopy' );
copy( N, x, strideX, offsetX, y, strideY, offsetY )
Copies elements from x
into y
.
var x = [ 1, 2, 3, 4, 5 ];
var y = [ 6, 7, 8, 9, 10 ];
copy( x.length, x, 1, 0, y, 1, 0 );
// y => [ 1, 2, 3, 4, 5 ]
The function
accepts the following parameters:
- N: number of elements to copy.
- x: input
array
ortyped array
. - strideX: index increment for
x
. - offsetX: starting index for
x
. - y: destination
array
ortyped array
. - strideY: index increment for
y
. - offsetY: starting index for
y
.
The N
, stride
, and offset
parameters determine how elements from x
are copied into y
. For example, to copy every other element in x
starting from the second element into the last N
elements in y
where x[i] = y[n]
, x[i+2] = y[n-1]
,...,
var x = [ 1, 2, 3, 4, 5, 6 ];
var y = [ 7, 8, 9, 10, 11, 12 ];
var N = Math.floor( x.length / 2 );
copy( N, x, 2, 1, y, -1, y.length-1 );
// y => [ 7, 8, 9, 6, 4, 2 ]
If N <= 0
, the function
returns undefined
.
Notes
Examples
var copy = require( 'blas-dcopy' );
var x;
var y;
var i;
x = new Float64Array( 10 );
y = new Uint8ClampedArray( 10 );
for ( i = 0; i < x.length; i++ ) {
x[ i ] = Math.round( Math.random()*500 );
y[ i ] = Math.round( Math.random()*255 );
}
console.log( x );
console.log( y );
// Copy elements from `x` into `y` starting from the end of `y`:
copy( x.length, x, 1, 0, y, -1, y.length-1 );
console.log( y );
To run the example code from the top-level application directory,
$ node ./examples/index.js
Tests
Unit
This repository uses tape for unit tests. To run the tests, execute the following command in the top-level application directory:
$ make test
All new feature development should have corresponding unit tests to validate correct functionality.
Test Coverage
This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:
$ make test-cov
Istanbul creates a ./reports/coverage
directory. To access an HTML version of the report,
$ make view-cov
Browser Support
This repository uses Testling for browser testing. To run the tests in a (headless) local web browser, execute the following command in the top-level application directory:
$ make test-browsers
To view the tests in a local web browser,
$ make view-browser-tests
License
Copyright
Copyright © 2016. The Compute.io Authors.