text: public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0){double result;try{double d = NumericFunction.SingleOperandEvaluate(arg0, srcRowIndex, srcColumnIndex);result = Evaluate(d);NumericFunction.CheckValue(result);}catch (EvaluationException e){return e.GetErrorEval();}return new NumberEval(result);}