fix bug in estimation input: filter_step_ahead

src/+gui_auxiliary/set_command_option.m

@@ -98,7 +98,7 @@ try
             end
 
         case 'filter_step_ahead'
-            options_.filter_step_ahead = eval(value);
+            options_.filter_step_ahead = str2num(value);
             
         case 'mcmc_jumping_covariance'
             if value == 2