The following section consists of a brief description of the error messages that can occur during PowerMath use. Suggestions for avoiding these errors are offered.
{Cannot Differentiate Expression}
The problem being evaluated is too difficult a Calculus problem. If possible, respecify the problem in simpler terms or define a Custom function.
{Cannot Expand This Series}
This error occurs if the problem involves a summation (such as a Taylor Expression), and the Function is not set up correctly.
{Cannot Find a Required Data Slate}
A Data Slate is referenced in a problem but cannot be found. If the problem involves either the LIST Command or a matrix, the Data Slate containing the information must be open. If it is open, make sure the title of the page matches the variable name in the problem which refers to it.
{Cannot Integrate Expression}
The problem being evaluated is too difficult a Calculus problem. If possible, respecify the problem in simpler terms. If a custom Function is being used, make sure it follows all rules for custom Functions.
{Cannot Parse Statement}
The problem text selected for evaluation cannot be broken down. Make sure the variables are correctly defined and parentheses are located correctly.
{Cannot Perform Numeric Division}
A problem occurred while performing division of large numbers. Quit PowerMath, return to the Finder's desktop, reenter PowerMath, and try the problem again. If PowerMath still fails, try to break the problem into smaller problems that can be run independently.
{Cannot Plot This Expression}
Check the PLOT Command to be sure you have set it up correctly. The PLOT parameters must be correctly defined and separated by semicolons. See Chapter III in the Manual for the exact syntax.
{Cannot Recognize Command}
Make sure that Commands used are valid Commands, and that the Command parameters are set up correctly. Refer to Chapter III in the Manual for a list of Commands and the syntax of their parameters.
{Delimiters Out Of Balance}
Expressions which utilizes parentheses must have a close parenthesis ")" for each open parenthesis "(". Semicolons, which are used in Functions, Commands, and matrices, must also be appropriately placed for the problem to be correctly evaluated.
{Equation Out Of Balance}
The left side of the equation does not equal the right side of the equation. This imbalance must be corrected before the problem can be reevaluated.
Use the CLEAR command, especially in conjunction with LIST to clear variables whose values are being reassigned during the same problem.
{Expression Cannot Be Interpreted}
This message may occur while doing Calculus problems that require a mathematical theorem not yet built into PowerMath. Perhaps a Custom Function can supply PowerMath with the means to solve the problem.
{Incorrect Argument List}
A Function may be incorrectly set up. (For example, using a comma where you should use a semicolon in the Function argument list.) The cause of this error may be subtle, so carefully examine all Command and Function parameters.
{Invalid Expression}
Check the problem to make sure all equations, Functions, Integrals and Differentials are set up correctly (including correct use of arguments and parameters). The problem may have a syntax error which has caused PowerMath to misinterpret the expression or problem. If you are using Custom Functions, make sure the correct Function Slate is open and the Function is correctly set up. For assistance, refer to the documentation sections on Functions (in Chapter IV) and Commands (in Chapter III).
{Keyboard Interruption}
Keyboard entry of [Control . (period)] aborted the problem evaluation.
{Matrix Rows or Columns are Inconsistant}
Check the matrix you are using. Make sure: data elements are separated by semicolons; the first element representing the number of columns is in parentheses on a line by itself; all elements are valid mathematical expressions; rows and columns are correct for the operation being performed.
{Matrix is Singular}
May appear while finding an inversion matrix. A singular matrix is one whose determinant is zero, or one which has row and column relationships that prevent an inversion from being found.
{More Variables than Equations}
Check the problem and make sure that if you are solving a simultaneous equation, the number of equations equals the number of unknowns.
{Not Enough Memory}
This error occurs when you have run out of memory. See Appendix D in the PowerMath manual.
{Number Larger Than Allowed Power}
This error occurs when the problem being evaluated results in a larger number than the program is customized to handle. Change the Power Limit setting in the Setting Dialogue Box on the Control menu to a larger size and re-evaluate the problem. See Chapter II in the Manual for a discussion of the Power Settings.
