A function defined in the Program Editor is similar to the functions built into the TI-Nspire™ Software.
| • | Functions must return a result, which can be graphed or entered in a table. Programs do not return a result. |
| • | You can use a function (but not a program) within an expression. For example: 3 ¦ func1(3) is valid, but not 3 ¦ prog1(3). |
| • | You can run programs from Calculator and Notes applications only. However, you can evaluate functions in Calculator, Notes, Lists & Spreadsheet, Graphs & Geometry, and Data & Statistics. |
| • | A function can refer to any variable; however, it can store a value to a local variable only. Programs can store to local and global variables. |
Note: Arguments used to pass values to a function are treated as local variables automatically. If you want to store to any other variables, you must declare them as Local from within the function.
| • | A function cannot call a program as a subroutine, but it can call another user-defined function. |
| • | You cannot define a program within a function. |
| • | A function cannot define a global function, but it can define a local function. |