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add STDEVP function support 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1901279 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
PJ Fanning 2022-05-26 10:53:56 +00:00
parent 83134076ed
commit d12fc44609
4 changed files with 81 additions and 0 deletions
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1
poi/src/main/java/org/apache/poi/ss/formula/eval/FunctionEval.java
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@ -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

8
poi/src/main/java/org/apache/poi/ss/formula/functions/AggregateFunction.java
View File

@ -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);

8
poi/src/main/java/org/apache/poi/ss/formula/functions/StatsLib.java
View File

@ -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) {

64
poi/src/test/java/org/apache/poi/ss/formula/functions/TestStdevp.java Normal file
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@ -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;
}
}