text: 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);}