Category Archive for: Equations and Computation

A note about function definitions

When you define a function, Mathcad does not try to evaluate it until you use it later on in the worksheet. If there is an error, the use of the function is marked in error, even though the real problem may be in the definition of the function itself. Figure 7-14 shows two examples of…

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Starting in manual mode

• Click “OK” to stop the calculations or “Cancel” to resume calculations. If you click “OK,” Mathcad displays a message on the message line to indicate that processing has been interrupted. The equation that was being processed when you pressed [Ese] is marked with an error message indicating that calculation has been interrupted. To resume…

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Controlling calculations

When you start Mathcad, you are in “automatic mode,” This means that Mathcad updates results in the worksheet window automatically. You can tell you’re in automatic mode because the word “Auto” appears in the message line, If you don’t want to wait for Mathcad to make computations as you edit, disable automatic mode by choosing…

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Copying numerical results

You can copy a numerical result and paste it either elsewhere in your worksheet or into another application. This allows you to copy an array of numbers directly spreadsheet or database into Mathcad where you can take advantage of its free-form interface and its advanced mathematical tools, and vice versa. Once you’ve performed the necessary…

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Evaluating expressions

To evaluate an expression, follow these steps: • Type an expression containing any valid combination of numbers, variables and functions. Any variables or functions in this expression should be defined earlier in the worksheet. • Press the “=” key. Mathcad computes the value of the expression and shows it after the equals sign. Whenever you…

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Recursive function definitions

Figure 7-4: The value of a user function depends on its arguments. Pro Mathcad supports recursive function definitions-you may define the value of a function in terms of a previous value of the function. As shown in Figure 7-5, recursive functions are useful for defining arbitrary periodic functions, as well as elegantly implementing numerical functions…

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Defining variables and functions

Whenever you type an equation into a worksheet, you are doing one of two things: • You could be typing an expression and asking Mathcad to give you the answer. This is discussed in the next section, “Evaluating expressions.” • You could be typing a variable or function name and assigning some value to it.…

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