--- /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 BESSELJ() function.
+ * <p>
+ * https://support.microsoft.com/en-us/office/besselj-function-839cb181-48de-408b-9d80-bd02982d94f7
+ */
+public final class BesselJ extends Fixed2ArgFunction implements FreeRefFunction {
+
+ public static final FreeRefFunction instance = new BesselJ();
+
+ @Override
+ public ValueEval evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg1, ValueEval arg2) {
+ try {
+ Double xval = evaluateValue(arg1, srcRowIndex, srcColumnIndex);
+ if (xval == null) {
+ return ErrorEval.VALUE_INVALID;
+ }
+ Double orderDouble = evaluateValue(arg2, srcRowIndex, srcColumnIndex);
+ if (orderDouble == null) {
+ return ErrorEval.VALUE_INVALID;
+ }
+ int order = orderDouble.intValue();
+ if (order < 0) {
+ return ErrorEval.NUM_ERROR;
+ }
+
+ org.apache.commons.math3.special.BesselJ bes = new org.apache.commons.math3.special.BesselJ(order);
+
+ return new NumberEval(bes.value(xval));
+ } catch (EvaluationException e) {
+ return e.getErrorEval();
+ }
+ }
+
+ @Override
+ public ValueEval evaluate(ValueEval[] args, OperationEvaluationContext ec) {
+ if (args.length == 2) {
+ return evaluate(ec.getRowIndex(), ec.getColumnIndex(), args[0], args[1]);
+ }
+
+ 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.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.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.assertDouble;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Tests for {@link BesselJ}
+ */
+final class TestBesselJ {
+
+ private static final OperationEvaluationContext ec = new OperationEvaluationContext(null, null, 0, 0, 0, null);
+
+ @Test
+ void testInvalid() {
+ confirmInvalidError("A1","B2");
+ }
+
+ @Test
+ void testNumError() {
+ confirmNumError("22.5","-40");
+ }
+
+ //https://support.microsoft.com/en-us/office/besselj-function-839cb181-48de-408b-9d80-bd02982d94f7
+ @Test
+ void testMicrosoftExample1() throws IOException {
+ try (HSSFWorkbook wb = new HSSFWorkbook()) {
+ HSSFSheet sheet = wb.createSheet();
+ HSSFRow row = sheet.createRow(0);
+ HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
+ HSSFCell cell = row.createCell(0);
+ //this tolerance is too high but commons-math3 and excel don't match up as closely as we'd like
+ double tolerance = 0.000001;
+ assertDouble(fe, cell, "BESSELJ(1.9, 2)", 0.329925829, tolerance);
+ assertDouble(fe, cell, "BESSELJ(1.9, 2.5)", 0.329925829, tolerance);
+ }
+ }
+
+ private static ValueEval invokeValue(String number1, String number2) {
+ ValueEval[] args = new ValueEval[] { new StringEval(number1), new StringEval(number2) };
+ return BesselJ.instance.evaluate(args, ec);
+ }
+
+ private static void confirmValue(String number1, String number2, double expected) {
+ ValueEval result = invokeValue(number1, number2);
+ assertEquals(NumberEval.class, result.getClass());
+ assertEquals(expected, ((NumberEval) result).getNumberValue(), 0.00000000000001);
+ }
+
+ private static void confirmInvalidError(String number1, String number2) {
+ ValueEval result = invokeValue(number1, number2);
+ assertEquals(ErrorEval.class, result.getClass());
+ assertEquals(ErrorEval.VALUE_INVALID, result);
+ }
+
+ private static void confirmNumError(String number1, String number2) {
+ ValueEval result = invokeValue(number1, number2);
+ assertEquals(ErrorEval.class, result.getClass());
+ assertEquals(ErrorEval.NUM_ERROR, result);
+ }
+
+}
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