Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 15x 15x 15x 15x 15x 15x 15x 11x 11x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 13x 2x 1x 1x 1x 1x 11x 13x 2x 2x 9x 9x 9x 9x 13x 5x 5x 5x 5x 4x 4x 4x 4x 4x 9x 9x 9x 13x 15x 1x 1x 1x 1x 1x | /*
* @license Apache-2.0
*
* Copyright (c) 2025 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
var isnan = require( '@stdlib/math/base/assert/is-nan' );
var Float64Array = require( '@stdlib/array/float64' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a moving arithmetic mean, ignoring `NaN` values.
*
* @param {PositiveInteger} W - window size
* @throws {TypeError} must provide a positive integer
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrnanmmean( 3 );
*
* var mu = accumulator();
* // returns null
*
* mu = accumulator( 2.0 );
* // returns 2.0
*
* mu = accumulator( -5.0 );
* // returns -1.5
*
* mu = accumulator( NaN );
* // returns -1.5
*
* mu = accumulator( 3.0 );
* // returns 0.0
*
* mu = accumulator( 5.0 );
* // returns 1.0
*
* mu = accumulator( NaN );
* // returns 1.0
*
* mu = accumulator();
* // returns 1.0
*/
function incrnanmmean( W ) {
var delta;
var buf;
var mu;
var N;
var i;
if ( !isPositiveInteger( W ) ) {
throw new TypeError( format( 'invalid argument. Must provide a positive integer. Value: `%s`.', W ) );
}
buf = new Float64Array( W );
mu = 0.0;
i = -1;
N = 0;
return accumulator;
/**
* If provided a value, the accumulator function returns an updated mean. If not provided a value, the accumulator function returns the current mean.
*
* @private
* @param {number} [x] - input value
* @returns {(number|null)} mean or null
*/
function accumulator( x ) {
if ( arguments.length === 0 ) {
if ( N === 0 ) {
return null;
}
return mu;
}
if ( isnan( x ) ) {
return mu;
}
// Update the index for managing the circular buffer:
i = (i+1) % W;
// Case: initial window...
if ( N < W ) {
N += 1;
delta = x - mu;
mu += delta / N;
}
// Case: buffer is full, so we need to update the sample mean...
else {
delta = x - buf[ i ];
mu += delta / W;
}
buf[ i ] = x;
return mu;
}
}
// EXPORTS //
module.exports = incrnanmmean;
|