trap possible cases where the option is type dates

matlab/set_default_option.m

@@ -41,9 +41,13 @@ if isempty(options.(field))
     return
 end
 
+if isdates(options.(field))
+    return
+end
+
 if isnan(options.(field))
     options.(field) = default;
     return
 end
 
-% 06/07/03 MJ added ; to eval expression
\ No newline at end of file
+% 06/07/03 MJ added ; to eval expression