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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 isPositiveInteger = require( '@stdlib/assert/is-positive-integer' ).isPrimitive;
var incrmsum = require( '@stdlib/stats/incr/msum' );
var incrmmean = require( '@stdlib/stats/incr/mmean' );
var incrmvariance = require( '@stdlib/stats/incr/mvariance' );
var incrmstdev = require( '@stdlib/stats/incr/mstdev' );
var incrmmin = require( '@stdlib/stats/incr/mmin' );
var incrmmax = require( '@stdlib/stats/incr/mmax' );
var incrmrange = require( '@stdlib/stats/incr/mrange' );
var incrmmidrange = require( '@stdlib/stats/incr/mmidrange' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a moving statistical summary.
*
* @param {PositiveInteger} W - window size
* @throws {TypeError} must provide a positive integer
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrmsummary( 3 );
*
* var summary = accumulator();
* // returns {}
*
* summary = accumulator( 2.0 );
* // returns {...}
*
* summary = accumulator( -5.0 );
* // returns {...}
*
* summary = accumulator();
* // returns {...}
*/
function incrmsummary( W ) {
var mvariance;
var mmidrange;
var summary;
var mrange;
var mstdev;
var mmean;
var msum;
var mmax;
var mmin;
if ( !isPositiveInteger( W ) ) {
throw new TypeError( format( 'invalid argument. Must provide a positive integer. Value: `%s`.', W ) );
}
mvariance = incrmvariance( W );
mmidrange = incrmmidrange( W );
mrange = incrmrange( W );
mstdev = incrmstdev( W );
mmean = incrmmean( W );
msum = incrmsum( W );
mmin = incrmmin( W );
mmax = incrmmax( W );
summary = {};
return accumulator;
/**
* If provided a value, the accumulator function returns an updated summary. If not provided a value, the accumulator function returns the current summary.
*
* @private
* @param {number} [x] - new value
* @returns {Object} summary
*/
function accumulator( x ) {
if ( arguments.length === 0 ) {
return summary;
}
summary.window = W;
summary.sum = msum( x );
summary.mean = mmean( x );
summary.variance = mvariance( x );
summary.stdev = mstdev( x );
summary.min = mmin( x );
summary.max = mmax( x );
summary.range = mrange( x );
summary.midrange = mmidrange( x );
return summary;
}
}
// EXPORTS //
module.exports = incrmsummary;
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