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* @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 isnan = require( '@stdlib/math/base/assert/is-nan' );
var incrmmda = require( '@stdlib/stats/incr/mmda' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a moving mean directional accuracy, ignoring `NaN` values.
*
* @param {PositiveInteger} W - window size
* @throws {TypeError} must provide a positive integer
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrnanmmda( 3 );
*
* var m = accumulator();
* // returns null
*
* m = accumulator( 2.0, 3.0 );
* // returns 1.0
*
* m = accumulator( 5.0, 2.0 );
* // returns 0.5
*
* m = accumulator( NaN, NaN );
* // returns 0.5
*
* m = accumulator( 3.0, 2.0 );
* // returns ~0.33
*
* m = accumulator( 4.0, NaN );
* // returns ~0.33
*
* m = accumulator( 4.0, 5.0 );
* // returns ~0.33
*
* m = accumulator();
* // returns ~0.33
*/
function incrnanmmda( W ) {
var mmda = incrmmda( W );
return accumulator;
/**
* If provided input values, the accumulator function returns an updated mean directional accuracy. If not provided input values or if either of the values provided is NaN, the accumulator function returns the current mean directional.
*
* @private
* @param {number} [f] - forecast value
* @param {number} [a] - actual value
* @returns {(number|null)} mean directional accuracy or null
*/
function accumulator( f, a ) {
if ( arguments.length === 0 || isnan( f ) || isnan( a ) ) {
return mmda();
}
return mmda( f, a );
}
}
// EXPORTS //
module.exports = incrnanmmda;
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