daxpy
Multiplies
x
and a constantalpha
and adds the result toy
.
Installation
$ npm install blas-daxpy
Usage
var daxpy = ;
daxpy( N, alpha, x, strideX, offsetY, y, strideY, offsetY )
Multiplies x
and a constant alpha
and adds the result to y
.
var x = 1 2 3 4 5 ;var y = 1 1 1 1 1 ;;// y => [ 6, 11, 16, 21, 26 ]
The function
accepts the following parameters:
- N: number of indexed elements.
- alpha:
numeric
constant. - x: input
array
ortyped array
. - strideX: index increment for
x
. - offsetX: starting index for
x
. - y: input
array
ortyped array
. - strideY: index increment for
y
. - offsetY: starting index for
y
.
The N
, stride
, and offset
parameters determine which elements in x
and y
are accessed at runtime. For example, to multiply every other element of x
starting from its second element by alpha
and add the result to y
starting from its last element,
var x = 1 2 3 4 5 6 ;var y = 1 1 1 1 1 1 ;var N = Math;;// y => [ 1, 1, 1, 31, 21, 11 ]
If N <= 0
, the function
returns undefined
.
Notes
Examples
var daxpy = ;var x;var y;var i;x = 10 ;y = 10 ;for i = 0; i < xlength; i++x i = Math;y i = Math;console;console;;console;
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.