Casio fx-991ES PLUS User Manual download pdf (Page 42)

E-41

Action: Make necessary corrections.

Argument ERROR

Cause: There is a problem with the argument of the calculation you are

performing.

Action: Make necessary corrections.

Dimension ERROR (MATRIX and VECTOR Modes only)

Cause: • The matrix or vector you are trying to use in a calculation was input

without specifying its dimension. • 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.

Action: Try increasing the

tol value. Note that this also decreases solution

precision.

Before Assuming Malfunction of the

Calculator...

Perform the following steps whenever an error occurs during a calculation

or when calculation results are not what you expected. If one step does not

correct the problem, move on to the next step.

Note that you should make separate copies of important data before

performing these steps.

1. Check the calculation expression to make sure that it does not contain any

errors.

2. Make sure that you are using the correct mode for the type of calculation

you are trying to perform.

3. If the above steps do not correct your problem, press the

 key. This will

cause the calculator to perform a routine that checks whether calculation

functions are operating correctly. If the calculator discovers any abnormality,

it automatically initializes the calculation mode and clears memory contents.

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Casio fx-991ES PLUS User Manual Page 42

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