How can I graph user-defined data?

In order to graph user-defined data, you need to use the Data>Define User Data option in the Interpreter.  In the Define User Data Equation dialog, new functions can be defined.

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User Data and Define User Data Equation dialogs

 

When graphing user-defined data, reference stages can be incorporated by adding a d or r prefix.

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Define result equations with reference stages in Define User Data Equation dialog