Computes the L2 norm of
The L2 norm is defined as
$ npm install blas-dnrm2
var dnrm2 = ;
dnrm2( N, x, stride, offset )
Computes the L2 norm.
var x = -2 1 3 -5 4 0 -1 -3 ;var nrm = ;// returns ~8.062
function accepts the following parameters:
- N: number of accessed elements.
- x: input
- stride: index increment.
- offset: starting index.
offset parameters determine which elements in
x are accessed when computing the L2 norm. For example, to select every other value starting from the second element,
var x = -2 1 3 -5 4 0 -1 -3 ;var N = Math;var stride = 2;var offset = 1;var nrm = ;// returns ~5.916
If any of the following conditions are met
N < 0
stride <= 0
offset < 0
N = 0, the
var dnrm2 = ;var rand;var sign;var x;var i;x = 100 ;for i = 0; i < xlength; i++rand = Math;sign = Math;if sign < 05sign = -1;elsesign = 1;x i = sign * rand;console;
To run the example code from the top-level application directory,
$ node ./examples/index.js
- Dahlquist, Germund and Bjorck, Ake. Numerical Methods in Scientific Computing.
- Blue, James (1978) "A Portable Fortran Program To Find the Euclidean Norm of a Vector". ACM Transactions on Mathematical Software.
- Higham, Nicholas J. Accuracy and Stability of Numerical Algorithms, Second Edition.
This module implements a one-pass algorithm proposed by S.J. Hammarling.
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.
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
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
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