Casio fx-991ES PLUS User Manual

• You are trying to perform a calculation with matrices or vectors whose
dimensions do not allow that type of calculation.
Action:
• Specify the dimension of the matrix or vector and then perform the
calculation again.
• Check the dimensions specified for the matrices or vectors to see if
they are compatible with the calculation.
Variable ERROR (SOLVE feature only)
Cause:
• You did not specify a solution variable, and there is no X variable in
the equation you input.
• The solution variable that you specified is not included in the equation
you input.
Action:
• The equation you input must include an X variable when you do not
specify the solution variable.
• Specify a variable that is included in the equation you input as the
solution variable.
Can't Solve Error (SOLVE feature only)
Cause:
• The calculator could not obtain a solution.
Action:
•
Check for errors in the equation that you input.
• Input a value for the solution variable that is close to the expected
solution and try again.
Insufficient MEM Error
Cause:
•
The configuration of TABLE Mode parameters caused more than 30
X-values to be generated for a table.
Action:
• Narrow the table calculation range by changing the Start, End, and
Step values, and try again.
Time Out Error
Cause:
•
The current differential or integration calculation ends without the
ending condition being fulfilled.
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Casio fx-991ES PLUS Specifications

General

Type	Scientific
Cover	No
Form factor	Desktop
Control type	Buttons
Product color	Gray
Digits	15 digits
Display type	Dot-matrix
Display resolution	96 x 31 pixels
Display number of lines	10 lines
Storage media type	Not available
Battery life	3 year(s)
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Symbolic notation	Square root
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	162 mm
Width	80 mm
Height	11.1 mm
Weight	95 g