introducing new test for 0/0 case in mjdgges

matlab/DsgeLikelihood.m

@@ -259,7 +259,7 @@ Model.H = H;
 [T,R,SteadyState,info,Model,DynareOptions,DynareResults] = dynare_resolve(Model,DynareOptions,DynareResults,'restrict');
 
 % Return, with endogenous penalty when possible, if dynare_resolve issues an error code (defined in resol).
-if info(1) == 1 || info(1) == 2 || info(1) == 5 || info(1) == 22 || info(1) == 24
+if info(1) == 1 || info(1) == 2 || info(1) == 5 || info(1) == 7 || info(1) == 22 || info(1) == 24
     fval = penalty+1;
     info = info(1);
     exit_flag = 0;

matlab/dr1.m

@@ -290,9 +290,13 @@ else  % use original Dynare solver
     mexErrCheck('mjdgges', err);
 
     if info1
+        if info1 == -30
+            info(1) = 7;
+        else
             info(1) = 2;
             info(2) = info1;
             info(3) = size(e,2);
+        end
         return
     end
 

matlab/print_info.m

@@ -49,7 +49,7 @@ if ~noprint
         error(['The Jacobian matrix evaluated at the steady state contains elements ' ...
                'that are not real or are infinite'])
       case 7
-        error(['One of the eigenvalues is is close to 0/0 (the absolute ' ...
+        error(['One of the eigenvalues is close to 0/0 (the absolute ' ...
                'value of numerator and denominator is smaller than 1e-6)'])
       case 19
         error('The steadystate file did not compute the steady state')

mex/sources/mjdgges/mjdgges.c

@@ -60,7 +60,15 @@ mjdgges(double *a, double *b, double *z, double *n, double *sdim, double *eval_r
   pei = eval_i;
   for (per = eval_r; per <= &eval_r[i_n-1]; ++per)
     {
+      if ((fabs(*par) > 1e-6) || (fabs(*pb) > 1e-6)) 
 	*per = *par / *pb;
+      else
+	{
+	  /* the ratio is too close to 0/0;
+	     returns specific error number only if no other error */
+	  if (i_info == 0)
+	    *info = -30;
+	}
       if (*pai == 0.0 && *pb == 0.0)
         *pei = 0.0;
       else