IUsing Undoing and Redoing Operations

You can use the following procedures during calculation expression input in the Math input/ output mode (up until you press the Ukey) to undo the last key operation and to redo the key operation you have just undone.

-To undo the last key operation, press: ?#(UNDO).

-To redo a key operation you have just undone, press: ?#(UNDO) again.

• You also can use UNDO to cancel an key operation. After pressing to clear an expression you have input, pressing ?#(UNDO) will restore what was on the display

before you pressed

.

•You also can use UNDO to cancel a cursor key operation. If you press C during input and then press ?#(UNDO), the cursor will return to where it was before you pressed C.

•The UNDO operation is disabled while the keyboard is alpha-locked. Pressing

?#(UNDO) while the keyboard is alpha-locked will perform the same delete operation as the #key alone.

Example

@6@C

#

?#(UNDO)

A

?#(UNDO)

IMath Input/Output Mode Calculation Result Display

Fractions, matrices, and lists produced by Math input/output mode calculations are displayed in natural format, just as they appear in your textbook.

Sample Calculation Result Displays

•Fractions are displayed either as improper fractions or mixed fractions, depending on the “Frac Result” setting on the Setup screen. For details, see “Using the Setup Screen” (page 1-26).

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