cobyla should return ROUNDOFF_LIMITED if it "converges" to zero x tolerance,...

cobyla should return ROUNDOFF_LIMITED if it "converges" to zero x tolerance, rather than XTOL_REACHED; thanks to David Liu for the bug report

Ignore-this: c5ac800405beb77a0b18a7ba8f20a4a4

darcs-hash:20120827175359-c8de0-1ee07387d0560bde56d8de9315c20b03e4fea186.gz

cobyla/cobyla.c

@@ -1193,8 +1193,8 @@ L550:
     }
     goto L140;
   }
-  else
-       rc = NLOPT_XTOL_REACHED;
+  else /* rho <= rhoend */
+       rc = rhoend > 0 ? NLOPT_XTOL_REACHED : NLOPT_ROUNDOFF_LIMITED;
 
 /* Return the best calculated values of the variables. */