| /* ==================================================================== |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed with |
| this work for additional information regarding copyright ownership. |
| The ASF licenses this file to You 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. |
| ==================================================================== */ |
| |
| package org.apache.poi.ss.formula.functions; |
| |
| /** |
| * Implementation of Excel function SUMXMY2()<p> |
| * |
| * Calculates the sum of squares of differences between two arrays of the same size.<br> |
| * <b>Syntax</b>:<br> |
| * <b>SUMXMY2</b>(<b>arrayX</b>, <b>arrayY</b>)<p> |
| * |
| * result = Σ<sub>i: 0..n</sub>(x<sub>i</sub>-y<sub>i</sub>)<sup>2</sup> |
| * |
| * @author Amol S. Deshmukh < amolweb at ya hoo dot com > |
| */ |
| public final class Sumxmy2 extends XYNumericFunction { |
| |
| private static final Accumulator XMinusYSquaredAccumulator = new Accumulator() { |
| public double accumulate(double x, double y) { |
| double xmy = x - y; |
| return xmy * xmy; |
| } |
| }; |
| |
| protected Accumulator createAccumulator() { |
| return XMinusYSquaredAccumulator; |
| } |
| } |