100 lines
2.6 KiB
JavaScript
100 lines
2.6 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
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var isArrayLike = require( '@stdlib/assert/is-array-like-object' );
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var incrmminmax = require( './../../../incr/mminmax' );
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var abs = require( '@stdlib/math/base/special/abs' );
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// MAIN //
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/**
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* Returns an accumulator function which incrementally computes moving minimum and maximum absolute values.
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*
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* @param {Collection} [out] - output array
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* @param {PositiveInteger} window - window size
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* @throws {TypeError} output argument must be array-like
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* @throws {TypeError} window size must be a positive integer
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* @returns {Function} accumulator function
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*
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* @example
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* var accumulator = incrmminmaxabs( 3 );
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*
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* var mm = accumulator();
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* // returns null
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*
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* mm = accumulator( 2.0 );
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* // returns [ 2.0, 2.0 ]
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*
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* mm = accumulator( -5.0 );
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* // returns [ 2.0, 5.0 ]
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*
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* mm = accumulator( 3.0 );
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* // returns [ 2.0, 5.0 ]
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*
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* mm = accumulator( 5.0 );
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* // returns [ 3.0, 5.0 ]
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*
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* mm = accumulator();
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* // returns [ 3.0, 5.0 ]
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*/
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function incrmminmaxabs( out, window ) {
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var minmax;
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var o;
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var W;
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if ( arguments.length === 1 ) {
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o = [ 0.0, 0.0 ];
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W = out;
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} else {
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if ( !isArrayLike( out ) ) {
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throw new TypeError( 'invalid argument. Output argument must be an array-like object. Value: `' + out + '`.' );
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}
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o = out;
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W = window;
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}
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if ( !isPositiveInteger( W ) ) {
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throw new TypeError( 'invalid argument. Window size must be a positive integer. Value: `' + W + '`.' );
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}
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minmax = incrmminmax( o, W );
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return accumulator;
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/**
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* If provided a value, the accumulator function returns updated minimum and maximum absolute values. If not provided a value, the accumulator function returns the current minimum and maximum absolute values.
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*
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* @private
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* @param {number} [x] - input value
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* @returns {(ArrayLikeObject|null)} output array or null
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*/
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function accumulator( x ) {
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if ( arguments.length === 0 ) {
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return minmax();
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}
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return minmax( abs( x ) );
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}
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}
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// EXPORTS //
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module.exports = incrmminmaxabs;
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