??? Undefined function or method 'gamma' for input arguments of type 'double' and attributes 'full scalar complex'.

Error in ==> swgarchlik at 171
        ratio1 = (gamma((parameters'*m_nu1'+1)*.5))/gamma((parameters'*m_nu1')*.5);

Error in ==> nlconst at 805
                f = feval(funfcn{3},x,varargin{:});

Error in ==> fmincon at 758
    [X,FVAL,LAMBDA,EXITFLAG,OUTPUT,GRAD,HESSIAN]=...

Error in ==> mrsgarchestfor_con_all at 240
        [parameters, LLF, EXITFLAG, OUTPUT, Lambda, GRAD, HESSIAN] =  fmincon('swgarchlik', x0 ,A, b, [],[],lowerBounds, upperBounds, [], options, data, errortype, flag1, constr);