Use this dialog box to set up the formulas that you can use to calculate your quantity takeoff.
To set up a formula, you can use the buttons in the dialog box and the keypad on your keyboard. There are menus in the dialog box from which you can choose properties and functions to insert into the formula.
If you enter a combination of items that is invalid, a parse error is displayed when you click OK.
- Expression field
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Specifies the formula.
- Calculator Buttons
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Enter numbers and operators into the Expression box to define the expression.
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Inserts a property into the Expression. Click the icon to display the list of properties relevant to the formula type. Select Item Area, Item Count, Item Length, Part Depth or a user-defined parameter to insert it in the Expression field.
Item Area takes the Area property of the object to which the pay item is attached. Item Length takes the Length property of the object to which the pay item is attached.
Part Depth applies only to pipe network parts (pipes and structures) and returns the average depth of the part. This is calculated as (max cover + min cover)/2 + the part OD.
User-defined parameters take the value assigned in the Pay Item Formula Parameters dialog box. If the pay item is a subassembly, and the parameter matches a parameter in the subassembly, the value from the subassembly is used. Otherwise, the specified value is used.
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Inserts a function into the expression. See Label Expression Functions for more information.
- Edit Parameters
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Edits the parameters of the formula in the Pay Item Formula Parameters dialog box, which allows you to define new parameters and set values or defaults.
Functions and Operators
For a list of functions and operators supported in this dialog box, see Label Expression Functions and Label Expression Operators.