uTo perform the RAM reset operation

Important!

•The RAM reset operation deletes all data that is temporarily stored in ClassPad RAM. Performing the RAM reset operation while a calculation is in progress will cause any data stored in RAM by the calculation to be lost.

•Perform the RAM reset operation only when your ClassPad freezes up or when it begins to operate abnormally for some reason.

1.Use the stylus to press the RESTART button on the back of the ClassPad.

•Following the RAM reset operation, the ClassPad restarts automatically.

2.After the ClassPad restarts, perform the ClassPad setup operation. For more information about the setup operation, see “Replacing Batteries and Setting Up the ClassPad” in the separate Quick Start Guide.

•The application menu appears after you finish the setup operation.

RESTART Button

Number of Digits and Precision
Number of DigitsStandard Mode

The following applies when the check box next to the “Decimal Calculation” item on the Basic Format dialog box is not selected.

•Up to 611 digits are stored in memory for integer values.

•Decimal values up to 15 digits are converted to fraction format and saved in memory. When a mathematical expression cannot be converted to fraction format, the result is displayed in decimal format.

•Values stored in memory are displayed as-is, regardless of how [Number Format] settings (Normal 1, Normal 2, Fix 0 to Fix 9, Sci 0 to Sci 9) are configured (except when a decimal value is displayed).

Decimal Mode

The following applies when the check box next to the “Decimal Calculation” item on the Basic Format dialog box is selected.

•Values stored in Ans memory and values assigned to variables have the same number of digits as defined for Standard mode values.

•Values are displayed in accordance with how [Number Format] settings (Normal 1, Normal 2, Fix 0 to Fix 9, Sci 0 to Sci 9) are configured.

•Displayed values are rounded to the appropriate number of decimal places.

•Some applications store values using a mantissa up to 15 digits long and a 3-digit exponent.

Precision

•Internal calculations are performed using 15 digits.

•The error for a single mathematical expression (Decimal mode calculation error) is ±1 at the 10th digit. In the case of exponential display, calculation error is ±1 at the least significant digit. Note that performing

consecutive calculations causes error to be cumulative. Error is also cumulative for internal consecutive calculations performed for: ^(xy), x', x!, nPr, nCr, etc.

•Error is cumulative and tends to be larger in the vicinity of a function’s singular point(s) and inflection point(s), and the vicinity of zero. With sinh(x) and tanh(x), for example, the inflection point occurs when x = 0. In this vicinity, error is cumulative and precision is poor.

Appendix 271