Your calculator manual is a very important resource when programming. Many problems can be solved by refering to it.

• Your program runs but you notice that the output from the program is always the same value.
  Check to see if you entered your function into the first position just as you would when graphing.  
• You immediately receive a SYNTAX error.
  Unfortunately this error message can refer to many things. If you use your calculator's feature for "going to" the error, you still might not see the problem. The cursor will most likely land on the last step that the calculator was able to perform. But this would be a good place to start. Check the lines of the program. Most often you have left out a line or two or even just a symbol. If you cannot find anything missing, try deleting that line and entering it again.  
• You immediately receive a DATA TYPE error.
  Most often this means that you or someone else has used the statistics feature and you still have the plot command in the ON position. Turn off all statistical plots.  
• Cleaning up variable memory in the TI-89.
  We recommend that you occasionally clean up the single variable values stored in positions a-z. You'll find the Clean Up feature under F6 on the home menu. Choose Clear a-z.

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