User Manual

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k Using 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 w key) to undo the last key operation and to redo the

key operation you have just undone.

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

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

• You also can use UNDO to cancel an A key operation. After pressing A to clear an

expression you have input, pressing aD(UNDO) will restore what was on the display

before you pressed A.

• You also can use UNDO to cancel a cursor key operation. If you press e during input and

then press aD(UNDO), the cursor will return to where it was before you pressed e.

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

aD(UNDO) while the keyboard is alpha-locked will perform the same delete operation

as the D key alone.

Example

b+vbe

aD(UNDO)

k Math Input/Output Mode Calculation Result Display

Fractions, matrices, vectors, 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).

• Matrices are displayed in natural format, up to 6 × 6. A matrix that has more than six rows or

columns will be displayed on a MatAns screen, which is the same screen used in the Linear

input/output mode.