optimize code in running time

Hi, is there any suggestion that how can I optimize the code in running time below. Thanks in advance

 lenx=length(x);
int = zeros(1,lenx);
dth2=dt/2;
  c=(k-1)/factorial(k-1);
  cmn=(lenx:-1:0)*dt;
  ft1=cmn.^(c);
  ft2 = (cmn+dt).^(c);
  for n = 1:lenx-2
      y1 = x(2:n+2) ;
      t1 = ft1(lenx-n+1:lenx+1) ;
      y2 = x(1:n+1) ;
      t2 = ft2(lenx-n+1:lenx+1); 
      int(n+2) = sum (t1.*y1 + t2.*y2)*dth2 ;
  end%for