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add DSTDEV function support 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1901258 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
PJ Fanning 2022-05-25 20:12:17 +00:00
parent d32b4c112e
commit 35be1fd6c0
6 changed files with 127 additions and 5 deletions
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2
poi/src/main/java/org/apache/poi/ss/formula/eval/FunctionEval.java
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@ -110,7 +110,7 @@ public final class FunctionEval {
retval[42] = new DStarRunner(DStarRunner.DStarAlgorithmEnum.DAVERAGE);
retval[43] = new DStarRunner(DStarRunner.DStarAlgorithmEnum.DMIN);
retval[44] = new DStarRunner(DStarRunner.DStarAlgorithmEnum.DMAX);
// 45: DSTDEV
retval[45] = new DStarRunner(DStarRunner.DStarAlgorithmEnum.DSTDEV);
retval[46] = AggregateFunction.VAR;
// 47: DVAR
retval[48] = TextFunction.TEXT;

10
poi/src/main/java/org/apache/poi/ss/formula/functions/DAverage.java
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@ -29,7 +29,7 @@ import java.math.MathContext;
* Gets the average value of a column in an area with given conditions.
*/
public final class DAverage implements IDStarAlgorithm {
private int count;
private long count;
private double total;
@Override
@ -43,10 +43,14 @@ public final class DAverage implements IDStarAlgorithm {
@Override
public ValueEval getResult() {
return count == 0 ? NumberEval.ZERO : new NumberEval(getAverage());
return count == 0 ? NumberEval.ZERO : new NumberEval(divide());
}
private double getAverage() {
private double divide() {
return divide(total, count);
}
private static double divide(final double total, final long count) {
return BigDecimal.valueOf(total)
.divide(BigDecimal.valueOf(count), MathContext.DECIMAL128)
.doubleValue();

2
poi/src/main/java/org/apache/poi/ss/formula/functions/DCount.java
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@ -26,7 +26,7 @@ import org.apache.poi.ss.formula.eval.ValueEval;
* Counts the value of a column in an area with given conditions.
*/
public final class DCount implements IDStarAlgorithm {
private int count;
private long count;
@Override
public boolean processMatch(ValueEval eval) {

2
poi/src/main/java/org/apache/poi/ss/formula/functions/DStarRunner.java
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@ -62,6 +62,8 @@ public final class DStarRunner implements Function3Arg {
DCOUNT(DCount::new),
/** @see DAverage */
DAVERAGE(DAverage::new),
/** @see DStdev */
DSTDEV(DStdev::new),
;
private final Supplier<IDStarAlgorithm> implSupplier;

54
poi/src/main/java/org/apache/poi/ss/formula/functions/DStdev.java Normal file
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@ -0,0 +1,54 @@
/* ====================================================================
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.ss.formula.eval.NumberEval;
import org.apache.poi.ss.formula.eval.NumericValueEval;
import org.apache.poi.ss.formula.eval.ValueEval;
import org.apache.poi.ss.util.NumberToTextConverter;
import java.math.BigDecimal;
import java.util.ArrayList;
/**
* Implementation of the DStdev function:
* Gets the standard deviation value of a column in an area with given conditions.
*/
public final class DStdev implements IDStarAlgorithm {
private final ArrayList<Double> values = new ArrayList<>();
@Override
public boolean processMatch(ValueEval eval) {
if (eval instanceof NumericValueEval) {
final double val = ((NumericValueEval)eval).getNumberValue();
values.add(val);
}
return true;
}
@Override
public ValueEval getResult() {
final double[] array = new double[values.size()];
int pos = 0;
for (Double d : values) {
array[pos++] = d;
}
final double stdev = StatsLib.stdev(array);
return new NumberEval(new BigDecimal(NumberToTextConverter.toText(stdev)).doubleValue());
}
}

62
poi/src/test/java/org/apache/poi/ss/formula/functions/TestDStdev.java Normal file
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@ -0,0 +1,62 @@
/* ====================================================================
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 DSTDEV()
*/
public class TestDStdev {
//https://support.microsoft.com/en-us/office/dstdev-function-026b8c73-616d-4b5e-b072-241871c4ab96
@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, "DSTDEV(A5:E11, \"Yield\", A1:A3)", 2.96647939483827, 0.0000000001);
}
}
private HSSFWorkbook initWorkbook1() {
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet();
addRow(sheet, 0, "Tree", "Height", "Age", "Yield", "Profit", "Height");
addRow(sheet, 1, "=Apple", ">10", null, null, null, "<16");
addRow(sheet, 2, "=Pear");
addRow(sheet, 3);
addRow(sheet, 4, "Tree", "Height", "Age", "Yield", "Profit");
addRow(sheet, 5, "Apple", 18, 20, 14, 105);
addRow(sheet, 6, "Pear", 12, 12, 10, 96);
addRow(sheet, 7, "Cherry", 13, 14, 9, 105);
addRow(sheet, 8, "Apple", 14, 15, 10, 75);
addRow(sheet, 9, "Pear", 9, 8, 8, 77);
addRow(sheet, 10, "Apple", 8, 9, 6, 45);
return wb;
}
}