Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | /**
* @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 incrsum = require( '@stdlib/stats/incr/sum' );
// MAIN //
/**
* Returns an accumulator function which incrementally computes a sum of products.
*
* @returns {Function} accumulator function
*
* @example
* var accumulator = incrsumprod();
*
* var sum = accumulator();
* // returns null
*
* sum = accumulator( 2.0, 3.0 );
* // returns 6.0
*
* sum = accumulator( -5.0, 2.0 );
* // returns -4.0
*
* sum = accumulator();
* // returns -4.0
*/
function incrsumprod() {
var sum = incrsum();
return accumulator;
/**
* If provided input values, the accumulator function returns an updated sum. If not provided input values, the accumulator function returns the current sum.
*
* @private
* @param {number} [x] - first value
* @param {number} [y] - second value
* @returns {(number|null)} sum-product or null
*/
function accumulator( x, y ) {
if ( arguments.length === 0 ) {
return sum();
}
return sum( x*y );
}
}
// EXPORTS //
module.exports = incrsumprod;
|