The picture below shows how you can define the base elements which will be used in generating the mathematical expression. When a parameter is added as "PARAM_X", the application knows that the output will be X and when you add "PARAM_something" the output will be "something". In order to generate an expression like X + Y + cos(X) + sin(Y) you need to define two parameters: PARAM_X and PARAM_Y and four base elements like PARAM_X, PARAM_Y, cos(PARAM_X), sin(PARAM_Y).

The base element is a custom defined string of characters (like sin(PARAM_X), cos(PARAM_Y), myfunction(PARAM_X), func()) which can or cannot have none, one or more parameters attached to it. It is your choice if you want to attach a parameter (or more parameters) to a base element or not. The application generates results using the base elements supplied and if a base element has parameters it will remove the "PARAM_" part from that parameter(s) and leave only the end part.

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