GPC Generalized Predictive Control error !

'mpcgain' function doesnt exist or what cuz it's not on help menu and it gives me error at run operation is there any alternative which can do it's function ?? code: Am=[0 1 0;0 0 1;0 -1.8 2.7]; Bm=[0;0;1]; Cm=[6 5 1]; Dm=0; N2=10; Nu=2; [Gt_G,Gt_F,Gt_w,A, B,C]= mpcgain(Am,Bm,Cm,Nu,N2);