--- /dev/null
+/* ====================================================================
+ 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.<p>
+ *
+ * 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
--- /dev/null
+/* ====================================================================
+ 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);
+ }
+
+}
projects / poi.git / commitdiff