Minimizes the function of several variables by using the Quasi-Newton optimization method with no log.

function BFGS(Fun: TRealFunction; Grad: TGrad; var Pars: Array of double; Const Consts: array of double; Const ObjConst: Array of TObject; out FMin: double; const FloatPrecision: TMtxFloatPrecision; DFPAlgo: Boolean): Integer; overload;