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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 incrmmeanstdev = require( '@stdlib/stats/incr/mmeanstdev' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a moving arithmetic mean and corrected sample standard deviation, ignoring `NaN` values.
*
* @param {Collection} [out] - output array
* @param {PositiveInteger} window - window size
* @throws {TypeError} output argument must be array-like
* @throws {TypeError} window size must be a positive integer
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrnanmmeanstdev( 3 );
*
* var v = accumulator();
* // returns null
*
* v = accumulator( 2.0 );
* // returns [ 2.0, 0.0 ]
*
* v = accumulator( NaN );
* // returns [ 2.0, 0.0 ]
*
* v = accumulator( -5.0 );
* // returns [ -1.5, ~4.95 ]
*
* v = accumulator( 3.0 );
* // returns [ 0.0, ~4.36 ]
*
* v = accumulator();
* // returns [ 0.0, ~4.36 ]
*/
function incrnanmmeanstdev( out, window ) {
var mmeanstdev;
if ( arguments.length === 1 ) {
mmeanstdev = incrmmeanstdev( out );
} else {
mmeanstdev = incrmmeanstdev( out, window );
}
return accumulator;
/**
* If provided a value, the accumulator function returns updated accumulated values. If provided `NaN` or no value, the accumulator function returns the current accumulated values.
*
* @private
* @param {number} [x] - input value
* @returns {(ArrayLikeObject|null)} output array or null
*/
function accumulator( x ) {
if ( arguments.length === 0 || isnan( x ) ) {
return mmeanstdev();
}
return mmeanstdev( x );
}
}
// EXPORTS //
module.exports = incrnanmmeanstdev;
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