mxSetName (MTT_MATLAB_P, "MTT_P");
  p = mxGetPr (MTT_MATLAB_P);
  for (i = 0; i < MTTNPAR; i++) {
    p[i] = mttpar[i];
  }
  mexPutArray (MTT_MATLAB_P, "base");

  /* call fsolve */
  mexEvalString ("MTT_Ui = fsolve (@<mtt_model_name>_sfun_ae, MTT_Ui, optimset('display','off','diagnostics','off'), MTT_X, MTT_U, MTT_T, MTT_P);");
  /* call solver */
  mexEvalString ("MTT_Ui = lsqnonlin (@<mtt_model_name>_sfun_ae, MTT_Ui, [], [], optimset('display','off','diagnostics','off','TolX',1e-2,'TolFun',1e-2), MTT_X, MTT_U, MTT_T, MTT_P);");

  /* retrieve result */
  MTT_MATLAB_Ui = mexGetArray ("MTT_Ui", "base");
  p = mxGetPr (MTT_MATLAB_Ui);
  for (i = 0; i < MTTNYZ; i++) {
    mttu[MTTNU + i] = p[i];
  }