From d12fc44609f235a6741bca73bd806386216c916b Mon Sep 17 00:00:00 2001 From: PJ Fanning Date: Thu, 26 May 2022 10:53:56 +0000 Subject: [PATCH] add STDEVP function support git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1901279 13f79535-47bb-0310-9956-ffa450edef68 --- .../poi/ss/formula/eval/FunctionEval.java | 1 + .../formula/functions/AggregateFunction.java | 8 +++ .../poi/ss/formula/functions/StatsLib.java | 8 +++ .../poi/ss/formula/functions/TestStdevp.java | 64 +++++++++++++++++++ 4 files changed, 81 insertions(+) create mode 100644 poi/src/test/java/org/apache/poi/ss/formula/functions/TestStdevp.java diff --git a/poi/src/main/java/org/apache/poi/ss/formula/eval/FunctionEval.java b/poi/src/main/java/org/apache/poi/ss/formula/eval/FunctionEval.java index 26e5d88ca9..992ad35c62 100644 --- a/poi/src/main/java/org/apache/poi/ss/formula/eval/FunctionEval.java +++ b/poi/src/main/java/org/apache/poi/ss/formula/eval/FunctionEval.java @@ -204,6 +204,7 @@ public final class FunctionEval { retval[189] = new DStarRunner(DStarRunner.DStarAlgorithmEnum.DPRODUCT); retval[190] = LogicalFunction.ISNONTEXT; + retval[193] = AggregateFunction.STDEVP; retval[194] = AggregateFunction.VARP; // 195: DSTDEVP // 196: DVARP diff --git a/poi/src/main/java/org/apache/poi/ss/formula/functions/AggregateFunction.java b/poi/src/main/java/org/apache/poi/ss/formula/functions/AggregateFunction.java index fc79c814c1..6ad53f887f 100644 --- a/poi/src/main/java/org/apache/poi/ss/formula/functions/AggregateFunction.java +++ b/poi/src/main/java/org/apache/poi/ss/formula/functions/AggregateFunction.java @@ -228,6 +228,14 @@ public abstract class AggregateFunction extends MultiOperandNumericFunction { return StatsLib.stdev(values); } }; + public static final Function STDEVP = new AggregateFunction() { + protected double evaluate(double[] values) throws EvaluationException { + if (values.length < 1) { + throw new EvaluationException(ErrorEval.DIV_ZERO); + } + return StatsLib.stdevp(values); + } + }; public static final Function SUM = new AggregateFunction() { protected double evaluate(double[] values) { return MathX.sum(values); diff --git a/poi/src/main/java/org/apache/poi/ss/formula/functions/StatsLib.java b/poi/src/main/java/org/apache/poi/ss/formula/functions/StatsLib.java index f7d79e0b5d..fb5aefc1aa 100644 --- a/poi/src/main/java/org/apache/poi/ss/formula/functions/StatsLib.java +++ b/poi/src/main/java/org/apache/poi/ss/formula/functions/StatsLib.java @@ -57,6 +57,14 @@ final class StatsLib { return r; } + public static double stdevp(double[] v) { + double r = Double.NaN; + if (v!=null && v.length > 1) { + r = Math.sqrt( devsq(v) / v.length ); + } + return r; + } + public static double var(double[] v) { double r = Double.NaN; if (v!=null && v.length > 1) { diff --git a/poi/src/test/java/org/apache/poi/ss/formula/functions/TestStdevp.java b/poi/src/test/java/org/apache/poi/ss/formula/functions/TestStdevp.java new file mode 100644 index 0000000000..15ea474bfa --- /dev/null +++ b/poi/src/test/java/org/apache/poi/ss/formula/functions/TestStdevp.java @@ -0,0 +1,64 @@ + +/* ==================================================================== + 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; + +import org.apache.poi.hssf.usermodel.HSSFCell; +import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator; +import org.apache.poi.hssf.usermodel.HSSFSheet; +import org.apache.poi.hssf.usermodel.HSSFWorkbook; +import org.junit.jupiter.api.Test; + +import java.io.IOException; + +import static org.apache.poi.ss.util.Utils.addRow; +import static org.apache.poi.ss.util.Utils.assertDouble; + +/** + * Testcase for function STDEVP() + */ +public class TestStdevp { + + //https://support.microsoft.com/en-us/office/stdevp-function-1f7c1c88-1bec-4422-8242-e9f7dc8bb195 + @Test + void testMicrosoftExample1() throws IOException { + try (HSSFWorkbook wb = initWorkbook1()) { + HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb); + HSSFCell cell = wb.getSheetAt(0).getRow(0).createCell(12); + assertDouble(fe, cell, "STDEVP(A3:A12)", 26.0545581424825, 0.00000000001); + assertDouble(fe, cell, "STDEV(A3:A12)", 27.4639157198435, 0.00000000001); + } + } + + private HSSFWorkbook initWorkbook1() { + HSSFWorkbook wb = new HSSFWorkbook(); + HSSFSheet sheet = wb.createSheet(); + addRow(sheet, 0, "Data"); + addRow(sheet, 1, "Strength"); + addRow(sheet, 2, 1345); + addRow(sheet, 3, 1301); + addRow(sheet, 4, 1368); + addRow(sheet, 5, 1322); + addRow(sheet, 6, 1310); + addRow(sheet, 7, 1370); + addRow(sheet, 8, 1318); + addRow(sheet, 9, 1350); + addRow(sheet, 10, 1303); + addRow(sheet, 11, 1299); + return wb; + } +} -- 2.39.5