C. Other Keys
5. Insert (INS), Delete (DEL) - Editing an Expression in the Entry Line
When editing a line, operation, program, etc, you will often need to Insert or Delete characters.
The default setting on the TI-89 is the insert mode.
When you press to evaluate an expression, the expression remains on the entry line and is highlighted. To edit the expression, remove the highlight by moving the cursor to the side of the expression that is to be edited.
Example: Evaluate the expression shown in the first panel.
(a) Edit the expression by adding 11/9 to the expression.
(b) Edit the expression by changing the 5 to a 4.
Expression is highlighted. Remove highlight by moving cursor
to one end of the expression.
Calculator is in insert mode, so type + 11/9
and press ENTER.
Press to move to
the front of the expression. Then move
the cursor until it is to the right
of the 5.
Use the backspace to remove the 5,
and then type 4.
You can see that it is quite simple to edit an entry line. You do not have to be in Delete Mode to delete characters. When you press the character to the right of the cursor is deleted. There are other ways to edit and repeat an entry line. To look at those operations go to the topic COPY, CUT, PASTE, or the topic ANS, ENTRY.