incrnancount

Compute a count incrementally, ignoring NaN values.

Installation

npm install @stdlib/stats-incr-nancount

Usage

var incrnancount = require( '@stdlib/stats-incr-nancount' );

incrnancount()

Returns an accumulator function which incrementally computes a count, ignoring NaN values.

var accumulator = incrnancount();

accumulator( [x] )

If provided an input value x, the accumulator function returns an updated count. If not provided an input value x, the accumulator function returns the current count.

var accumulator = incrnancount();

var count = accumulator( 2.0 );
// returns 1

count = accumulator( 1.0 );
// returns 2

count = accumulator( NaN );
// returns 2

count = accumulator( 3.0 );
// returns 3

count = accumulator();
// returns 3

Examples

var randu = require( '@stdlib/random-base-randu' );
var incrnancount = require( '@stdlib/stats-incr-nancount' );

var accumulator;
var v;
var i;

// Initialize an accumulator:
accumulator = incrnancount();

// For each simulated datum, update the count...
for ( i = 0; i < 100; i++ ) {
    if ( randu() < 0.2 ) {
        v = NaN;
    } else {
        v = randu() * 100.0;
    }
    accumulator( v );
}
console.log( accumulator() );

See Also

• @stdlib/stats-incr/nansum: compute a sum incrementally, ignoring NaN values.

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.

Copyright

Copyright © 2016-2024. The Stdlib Authors.