Texas Instruments TITANIUM TI-89 User Manual page 529

1. Move the cursor to any cell in the column and press †.
– or –
Move the cursor to the header cell (
Notes:
¸ is not required if you want to type a new definition or replace the existing
•
one. However, if you want to edit the existing definition, you must press ¸.
To view an existing definition, press † or move the cursor to the header cell
•
and look at the entry line.
2. Type the new expression, which replaces any existing definition.
If you used † or ¸ in Step 1, the cursor moved to the entry line and highlighted
the existing definition, if any. You can also:
Press M to clear the highlighted expression. Then type the new expression.
•
– or –
Data/Matrix Editor
, etc.) and press ¸.
,
c1 c2
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