@CalcMgrExcelXIRR
Purpose:
Returns the internal rate of return for a schedule of cash flows that is not necessarily periodic
Syntax:
Java Class: com.hyperion.calcmgr.common.excel.cdf.ExcelFinancialFunctions.XIRR(double[],double[],double)
CDF Spec: @CalcMgrExcelXIRR(values, dates, guess)