Texas Instruments TI-89 Manuel D’Utilisation

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Arguments (x and y in these examples) are placeholders that represent whatever values 
you pass to the function. They do not represent the variables x and y unless you 
specifically pass x and y as the arguments when you evaluate the function.
Creating a User-Defined Function
Creating a User-Defined Function
Creating a User-Defined Function
Creating a User-Defined Function
Use one of the following methods.
Method
Description
§
Store an expression to a function name (including 
the argument list).
Define command
Define a function name (including the argument 
list) as an expression.
Program Editor
Refer to Programming  or information on creating a 
user-defined function.