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@stdlib/blas-ext-base-ndarray-snansumpw
@stdlib/blas-ext-base-ndarray-snansumpw/lib/index.js

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Readme

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snansumpw

Compute the sum of a one-dimensional single-precision floating-point ndarray, ignoring NaN values and using pairwise summation.

Installation

npm install @stdlib/blas-ext-base-ndarray-snansumpw

Usage

var snansumpw = require( '@stdlib/blas-ext-base-ndarray-snansumpw' );

snansumpw( arrays )

Computes the sum of a one-dimensional single-precision floating-point ndarray, ignoring NaN values and using pairwise summation.

var Float32Array = require( '@stdlib/array-float32' );
var ndarray = require( '@stdlib/ndarray-base-ctor' );

var xbuf = new Float32Array( [ 1.0, -2.0, NaN, 2.0 ] );
var x = new ndarray( 'float32', xbuf, [ 4 ], [ 1 ], 0, 'row-major' );

var v = snansumpw( [ x ] );
// returns 1.0

The function has the following parameters:

arrays: array-like object containing a one-dimensional input ndarray.

Notes

If provided an empty one-dimensional ndarray, the function returns 0.0.
In general, pairwise summation is more numerically stable than ordinary recursive summation (i.e., "simple" summation), with slightly worse performance. While not the most numerically stable summation technique (e.g., compensated summation techniques such as the Kahan–Babuška-Neumaier algorithm are generally more numerically stable), pairwise summation strikes a reasonable balance between numerical stability and performance. If either numerical stability or performance is more desirable for your use case, consider alternative summation techniques.

Examples

var bernoulli = require( '@stdlib/random-base-bernoulli' );
var discreteUniform = require( '@stdlib/random-base-discrete-uniform' );
var filledarrayBy = require( '@stdlib/array-filled-by' );
var ndarray = require( '@stdlib/ndarray-base-ctor' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var snansumpw = require( '@stdlib/blas-ext-base-ndarray-snansumpw' );

function clbk() {
    if ( bernoulli( 0.7 ) > 0 ) {
        return discreteUniform( 0, 100 );
    }
    return NaN;
}

var xbuf = filledarrayBy( 10, 'float32', clbk );
var x = new ndarray( 'float32', xbuf, [ xbuf.length ], [ 1 ], 0, 'row-major' );
console.log( ndarray2array( x ) );

var v = snansumpw( [ x ] );
console.log( v );

References

Higham, Nicholas J. 1993. "The Accuracy of Floating Point Summation." SIAM Journal on Scientific Computing 14 (4): 783–99. doi:10.1137/0914050.

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, 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.

Community

License

See LICENSE.

@stdlib/blas-ext-base-ndarray-snansumpw