/* * 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. */ /* * Created on May 6, 2005 * */ namespace HH.WMS.Utils.NPOI.SS.Formula.Functions { using System; using HH.WMS.Utils.NPOI.SS.Formula.Eval; /** * @author Amol S. Deshmukh < amolweb at ya hoo dot com > * Log: LOG(number,[base]) */ public class Log : Var1or2ArgFunction { public Log() { // no instance fields } public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0) { double result; try { double d0 = NumericFunction.SingleOperandEvaluate(arg0, srcRowIndex, srcColumnIndex); result = Math.Log(d0) / NumericFunction.LOG_10_TO_BASE_e; NumericFunction.CheckValue(result); } catch (EvaluationException e) { return e.GetErrorEval(); } return new NumberEval(result); } public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1) { double result; try { double d0 = NumericFunction.SingleOperandEvaluate(arg0, srcRowIndex, srcColumnIndex); double d1 = NumericFunction.SingleOperandEvaluate(arg1, srcRowIndex, srcColumnIndex); double logE = Math.Log(d0); double base1 = d1; if (base1 == Math.E) { result = logE; } else { result = logE / Math.Log(base1); } NumericFunction.CheckValue(result); } catch (EvaluationException e) { return e.GetErrorEval(); } return new NumberEval(result); } } }