Is it OK to call an analog function from another analog function?

For example,

/*****example start*****/
analog function real f1;
   input x;
   real x;
   begin
       f1 = x*2;
   end
endfunction

analog function real f2;
   input x;
   real x;
   begin
       f2 = f1(x)+1;
   end
endfunction

/*****example end*****/

Thanks!