Texas Instruments TITANIUM TI-89 User Manual

Page 595

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Programming

595

Note:

If a program has local variables, a graphed function cannot access them. For

example:

may display an error or an unexpected result (if

is an existing variable in the current

folder).

Circular Definition Errors

When evaluating a user-defined function or running a program, you can specify an
argument that includes the same variable that was used to define the function or create
the program. However, to avoid Circular definition errors, you must assign a value for
x or i variables that are used in evaluating the function or running the program.
For example:

Causes a

Circular definition

error message if x or i does not have a value. The error

does not occur if x or i has already been assigned a value.

Local a

Graph a

cos(x)

x+1

– or –

For i,i,10,1

Disp i

EndFor