internal override void InitializeFunctionAndJacobian(OdeFunction fun, OdeJacobian jac)
 {
     _fex = new FEX(this._NEquations, fun);
     _jex = new JEX(this._NEquations, jac);
 }
 internal override void InitializeFunctionAndJacobian(OdeFunction fun, OdeJacobian jac)
 {
     _fex = new FEX(this._NEquations, fun);
     _jex = new JEX(this._NEquations, jac);
 }