Fig.11 Parameter-EditorEnter a permissible name into the top field(the descriptor must not contain any mathematical operators)Now,you can enter a number,a formula or your choice of text into the field below.If you wish to enter a formula,you can use the two lists below.You can select a random entry either by double-clicking on using the space bar.If you click on OK,the result will be displayed in the table.The formula must be syntactically and semantically correct,otherwise,the formula will be displayed instead of a result in the parameter table