From: PJ Fanning Date: Wed, 26 Jan 2022 10:07:15 +0000 (+0000) Subject: standardize function X-Git-Tag: REL_5_2_1~146 X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=a56a6ba924e5454c1a1a28262288916b1efe371e;p=poi.git standardize function git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1897493 13f79535-47bb-0310-9956-ffa450edef68 --- 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 60899ae9ed..b22ec1ef6a 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 @@ -276,7 +276,7 @@ public final class FunctionEval { retval[294] = NormSDist.instance; retval[295] = NormInv.instance; retval[296] = NormSInv.instance; - // 297: STANDARDIZE + retval[297] = Standardize.instance; retval[298] = NumericFunction.ODD; // 299: PERMUT retval[300] = NumericFunction.POISSON; diff --git a/poi/src/main/java/org/apache/poi/ss/formula/functions/Standardize.java b/poi/src/main/java/org/apache/poi/ss/formula/functions/Standardize.java new file mode 100644 index 0000000000..5e34ebf80c --- /dev/null +++ b/poi/src/main/java/org/apache/poi/ss/formula/functions/Standardize.java @@ -0,0 +1,79 @@ +/* ==================================================================== + 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.OperationEvaluationContext; +import org.apache.poi.ss.formula.eval.ErrorEval; +import org.apache.poi.ss.formula.eval.EvaluationException; +import org.apache.poi.ss.formula.eval.NumberEval; +import org.apache.poi.ss.formula.eval.OperandResolver; +import org.apache.poi.ss.formula.eval.ValueEval; + +import java.math.BigDecimal; +import java.math.MathContext; + +/** + * Implementation for Excel STANDARDIZE() function.

+ * + * https://support.microsoft.com/en-us/office/standardize-function-81d66554-2d54-40ec-ba83-6437108ee775 + */ +public final class Standardize extends Fixed3ArgFunction implements FreeRefFunction { + + public static final Standardize instance = new Standardize(); + + @Override + public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg1, ValueEval arg2, ValueEval arg3) { + try { + Double xval = evaluateValue(arg1, srcRowIndex, srcColumnIndex); + if (xval == null) { + return ErrorEval.VALUE_INVALID; + } + Double mean = evaluateValue(arg2, srcRowIndex, srcColumnIndex); + if (mean == null) { + return ErrorEval.VALUE_INVALID; + } + Double stdev = evaluateValue(arg3, srcRowIndex, srcColumnIndex); + if (stdev == null) { + return ErrorEval.VALUE_INVALID; + } else if (stdev.doubleValue() <= 0) { + return ErrorEval.NUM_ERROR; + } + + BigDecimal result = new BigDecimal(xval.doubleValue() - mean.doubleValue()) + .divide(new BigDecimal(stdev), MathContext.DECIMAL128); + return new NumberEval(result.doubleValue()); + } catch (EvaluationException e) { + return e.getErrorEval(); + } + } + + @Override + public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) { + if (args.length == 3) { + return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0], args[1], args[2]); + } + + return ErrorEval.VALUE_INVALID; + } + + private static Double evaluateValue(ValueEval arg, int srcRowIndex, int srcColumnIndex) throws EvaluationException { + ValueEval veText = OperandResolver.getSingleValue(arg, srcRowIndex, srcColumnIndex); + String strText1 = OperandResolver.coerceValueToString(veText); + return OperandResolver.parseDouble(strText1); + } +} \ No newline at end of file diff --git a/poi/src/test/java/org/apache/poi/ss/formula/functions/TestNormSDist.java b/poi/src/test/java/org/apache/poi/ss/formula/functions/TestNormSDist.java index 5fd209eba0..a5a3922b9f 100644 --- a/poi/src/test/java/org/apache/poi/ss/formula/functions/TestNormSDist.java +++ b/poi/src/test/java/org/apache/poi/ss/formula/functions/TestNormSDist.java @@ -23,7 +23,6 @@ import org.apache.poi.hssf.usermodel.HSSFRow; import org.apache.poi.hssf.usermodel.HSSFSheet; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.ss.formula.OperationEvaluationContext; -import org.apache.poi.ss.formula.eval.BoolEval; import org.apache.poi.ss.formula.eval.ErrorEval; import org.apache.poi.ss.formula.eval.NumberEval; import org.apache.poi.ss.formula.eval.StringEval; diff --git a/poi/src/test/java/org/apache/poi/ss/formula/functions/TestStandardize.java b/poi/src/test/java/org/apache/poi/ss/formula/functions/TestStandardize.java new file mode 100644 index 0000000000..9150573d5d --- /dev/null +++ b/poi/src/test/java/org/apache/poi/ss/formula/functions/TestStandardize.java @@ -0,0 +1,98 @@ +/* ==================================================================== + 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.apache.poi.ss.formula.OperationEvaluationContext; +import org.apache.poi.ss.formula.eval.ErrorEval; +import org.apache.poi.ss.formula.eval.NumberEval; +import org.apache.poi.ss.formula.eval.StringEval; +import org.apache.poi.ss.formula.eval.ValueEval; +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; +import static org.junit.jupiter.api.Assertions.assertEquals; + +/** + * Tests for {@link Standardize} + */ +final class TestStandardize { + + private static final OperationEvaluationContext ec = new OperationEvaluationContext(null, null, 0, 0, 0, null); + + @Test + void testBasic() { + confirmValue("42", "40", "1.5", 1.33333333); + } + + @Test + void testInvalid() { + confirmInvalidError("A1","B2","C2"); + } + + @Test + void testNumError() { + confirmNumError("42","40","0"); + confirmNumError("42","40","-0.1"); + } + + //https://support.microsoft.com/en-us/office/standardize-function-81d66554-2d54-40ec-ba83-6437108ee775 + @Test + void testMicrosoftExample1() throws IOException { + try (HSSFWorkbook wb = new HSSFWorkbook()) { + HSSFSheet sheet = wb.createSheet(); + addRow(sheet, 0, "Data", "Description"); + addRow(sheet, 1, 42, "Value to normalize"); + addRow(sheet, 2, 40, "Arithmetic mean of the distribution"); + addRow(sheet, 3, 1.5, "Standard deviation of the distribution"); + HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb); + HSSFCell cell = wb.getSheetAt(0).getRow(0).createCell(100); + assertDouble(fe, cell, "STANDARDIZE(A2,A3,A4)", 1.33333333, 0.000001); + } + } + + private static ValueEval invokeValue(String number1, String number2, String number3) { + ValueEval[] args = new ValueEval[] { new StringEval(number1), new StringEval(number2), new StringEval(number3)}; + return Standardize.instance.evaluate(args, ec); + } + + private static void confirmValue(String number1, String number2, String number3, double expected) { + ValueEval result = invokeValue(number1, number2, number3); + assertEquals(NumberEval.class, result.getClass()); + assertEquals(expected, ((NumberEval) result).getNumberValue(), 0.0000001); + } + + private static void confirmInvalidError(String number1, String number2, String number3) { + ValueEval result = invokeValue(number1, number2, number3); + assertEquals(ErrorEval.class, result.getClass()); + assertEquals(ErrorEval.VALUE_INVALID, result); + } + + private static void confirmNumError(String number1, String number2, String number3) { + ValueEval result = invokeValue(number1, number2, number3); + assertEquals(ErrorEval.class, result.getClass()); + assertEquals(ErrorEval.NUM_ERROR, result); + } + +}