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* @license Apache-2.0
*
* Copyright (c) 2018 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 incrmmidrange = require( '@stdlib/stats/incr/mmidrange' );
var isnan = require( '@stdlib/math/base/assert/is-nan' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a moving mid-range.
*
* @param {PositiveInteger} W - window size
* @throws {TypeError} must provide a positive integer
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrmmidrange( 3 );
*
* var mr = accumulator();
* // returns null
*
* mr = accumulator( 2.0 );
* // returns 2.0
*
* mr = accumulator( -5.0 );
* // returns -1.5
*
* mr = accumulator( 3.0 );
* // returns -1.0
*
* mr = accumulator( 5.0 );
* // returns 0.0
*
* mr = accumulator( NaN );
* // returns 0.0
*
* mr = accumulator();
* // returns 0.0
*/
function incrnanmmidrange( W ) {
var nanmmidrange = incrmmidrange( W );
return accumulator;
function accumulator( x ) {
if ( arguments.length === 0 || isnan( x ) ) {
return nanmmidrange();
}
return nanmmidrange( x );
};
}
// EXPORTS //
module.exports = incrnanmmidrange;
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