Casio fxcp400 fxcp400 User Manual
Appendix
271
u To 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.
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.
and Setting Up the ClassPad” in the separate Quick Start Guide.
• The application menu appears after you finish the setup operation.
Number of Digits and Precision
Number of Digits
Standard Mode
The following applies when the check box next to the
“Decimal Calculation” item on the Basic Format dialog
box is not selected.
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.
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).
(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.
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.
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.
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: ^(
consecutive calculations causes error to be cumulative. Error is also cumulative for internal consecutive
calculations performed for: ^(
x
y
),
x
',
x
!,
n
P
r
,
n
C
r
, 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.
RESTART
Button
Button