| /* ==================================================================== |
| 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 junit.framework.TestCase; |
| |
| 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.ValueEval; |
| |
| /** |
| * Tests for Excel function POISSON(x,mean,cumulative) |
| * @author Kalpesh Parmar |
| */ |
| public class TestPoisson extends TestCase { |
| |
| private static final double DELTA = 1E-15; |
| |
| private static ValueEval invokePoisson(double x, double mean, boolean cumulative) |
| { |
| |
| ValueEval[] valueEvals = new ValueEval[3]; |
| valueEvals[0] = new NumberEval(x); |
| valueEvals[1] = new NumberEval(mean); |
| valueEvals[2] = BoolEval.valueOf(cumulative); |
| |
| return NumericFunction.POISSON.evaluate(valueEvals,-1,-1); |
| } |
| |
| public void testCumulativeProbability() |
| { |
| double x = 1; |
| double mean = 0.2; |
| double result = 0.9824769036935787; // known result |
| |
| NumberEval myResult = (NumberEval)invokePoisson(x,mean,true); |
| |
| assertEquals(myResult.getNumberValue(), result, DELTA); |
| } |
| |
| public void testNonCumulativeProbability() |
| { |
| double x = 0; |
| double mean = 0.2; |
| double result = 0.8187307530779818; // known result |
| |
| NumberEval myResult = (NumberEval)invokePoisson(x,mean,false); |
| |
| assertEquals(myResult.getNumberValue(), result, DELTA); |
| } |
| |
| public void testNegativeMean() |
| { |
| double x = 0; |
| double mean = -0.2; |
| |
| ErrorEval myResult = (ErrorEval)invokePoisson(x,mean,false); |
| |
| assertEquals(ErrorEval.NUM_ERROR.getErrorCode(), myResult.getErrorCode()); |
| } |
| |
| public void testNegativeX() |
| { |
| double x = -1; |
| double mean = 0.2; |
| |
| ErrorEval myResult = (ErrorEval)invokePoisson(x,mean,false); |
| |
| assertEquals(ErrorEval.NUM_ERROR.getErrorCode(), myResult.getErrorCode()); |
| } |
| |
| |
| |
| public void testXAsDecimalNumber() |
| { |
| double x = 1.1; |
| double mean = 0.2; |
| double result = 0.9824769036935787; // known result |
| |
| NumberEval myResult = (NumberEval)invokePoisson(x,mean,true); |
| |
| assertEquals(myResult.getNumberValue(), result, DELTA); |
| } |
| |
| public void testXZeroMeanZero() |
| { |
| double x = 0; |
| double mean = 0; |
| double result = 1; // known result in excel |
| |
| NumberEval myResult = (NumberEval)invokePoisson(x,mean,true); |
| |
| assertEquals(myResult.getNumberValue(), result, DELTA); |
| } |
| } |