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function [x] = mtt_update(dx,x,AAx,AA,dt,STEPFACTOR,Nx,METHOD);
if (METHOD==1) #Euler
ddt = dt/STEPFACTOR;
x = x + dx*ddt;
elseif ((METHOD==2)||(METHOD==3))#Linear implicit or Implicit
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function [x] = mtt_update(dx,x,dt,STEPFACTOR,METHOD,name);
if (METHOD==1) #Euler
ddt = dt/STEPFACTOR;
x = x + dx*ddt;
elseif (METHOD==2) #Linear implicit or Implicit
eval("[AA,AAx] = ",name,"_smx;");
x = AA\(AAx + dx*dt);
else
error("Method %i is not defined", METHOD);
endif;
endfunction;
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