Compute a harmonic mean incrementally, ignoring
NaNvalues.
The harmonic mean of positive real numbers x_0, x_1, ..., x_{n-1} is defined as
var incrnanhmean = require( '@stdlib/stats/incr/nanhmean' );Returns an accumulator function which incrementally computes a harmonic mean, ignoring NaN values.
var accumulator = incrnanhmean();If provided an input value x, the accumulator function returns an updated harmonic mean. If not provided an input value x, the accumulator function returns the current harmonic mean.
var accumulator = incrnanhmean();
var v = accumulator( 2.0 );
// returns 2.0
v = accumulator( 1.0 );
// returns ~1.33
v = accumulator( NaN );
// returns ~1.33
v = accumulator( 3.0 );
// returns ~1.64
v = accumulator();
// returns ~1.64- Input values are not type checked. If non-numeric inputs are possible, you are advised to type check and handle accordingly before passing the value to the accumulator function.
var uniform = require( '@stdlib/random/base/uniform' );
var bernoulli = require( '@stdlib/random/base/bernoulli' );
var incrnanhmean = require( '@stdlib/stats/incr/nanhmean' );
var accumulator;
var v;
var i;
// Initialize an accumulator:
accumulator = incrnanhmean();
// For each simulated datum, update the harmonic mean...
for ( i = 0; i < 100; i++ ) {
if ( bernoulli( 0.2 ) ) {
v = NaN;
} else {
v = uniform( 1.0, 100.0 );
}
accumulator( v );
}
console.log( accumulator() );