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* @license Apache-2.0
*
* Copyright (c) 2026 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 incrmpe = require( '@stdlib/stats/incr/mpe' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes the mean percentage error, ignoring `NaN` values.
*
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrnanmpe();
*
* var m = accumulator();
* // returns null
*
* m = accumulator( 2.0, 3.0 );
* // returns ~33.33
*
* m = accumulator( NaN, 5.0 );
* // returns ~33.33
*
* m = accumulator( 5.0, 2.0 );
* // returns ~-58.33
*
* m = accumulator();
* // returns ~-58.33
*/
function incrnanmpe() {
var mpe = incrmpe();
return accumulator;
/**
* If provided input values, the accumulator function returns an updated mean percentage error. If not provided input values, the accumulator function returns the current mean percentage error.
*
* @private
* @param {number} [f] - input value (forecast)
* @param {number} [a] - input value (actual)
* @returns {(number|null)} mean percentage error or null
*/
function accumulator( f, a ) {
if ( arguments.length === 0 || isnan( f ) || isnan( a ) ) {
return mpe();
}
return mpe( f, a );
}
}
// EXPORTS //
module.exports = incrnanmpe;
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