Specify Calculation dialog box
This dialog box appears so that you can build a formula for a calculation or calculated field.
 1 If necessary, for Evaluate this calculation from the context of, choose a table from the list.
Setting the context for a calculation is only necessary when you're creating a calculation field in a source table that has two or more occurrences in the relationships graph. The choice you make may affect the calculation results, particularly if your calculation will include fields in related tables.
 2 Build a formula for your calculation.
Click where you want the item to appear in the formula box, then do the following. (You can also type the formula into the box.)

 To add a Do this Reference to a field In the field list, double-click a field name. To display field names from another table, choose a table from the tables list. Note  When the Specify Calculation dialog box opens from within the Replace Field Contents and Send Mail dialog boxes, the tables list may default to Current Layout (LayoutName) and display only the visible fields on the current layout. To display all field names from the current table, choose Current Table (TableName) from the list. Mathematical or text operator For Operators, click a button or type an operator. See Mathematical operators and Text operators. Comparison or logical operator, or an exponent For Operators, double-click an operator in the list or type an operator. See Comparison operators and Logical operators. Constant value Type the value. Function
To quickly build a formula:
 • Tab to or click in the field, operators, or functions list.
 • Type the first few letters of a field name, operator, or function to move to that item in the list.
 • Press Insert (Windows) or the Space bar (OS X) to place it in the formula box.
 3 Select calculation options for the field.

 To Do this Set the field type of the result Choose a data type for Calculation result is . Make a calculated field repeating Select Number of repetitions, then type the number of repetitions. See Defining repeating fields. Prevent calculation if all referenced fields are empty Select Do not evaluate if all referenced fields are empty. When enabled, FileMaker Pro does not evaluate a calculation if all fields used by the calculation are empty. This typically improves performance.
 4 To select indexing and storage options for the field, click Storage Options, select options in the Storage Options dialog box, then click OK.
 5 Click OK.
Notes
 • You can type field names, operators, and functions in the Specify Calculation dialog box instead of using the fields or operators lists.
 • If you are using FileMaker Pro Advanced to customize menus, you can base a menu or menu item title on the result of a calculation. You can also create tooltips based on a calculation. See Defining custom menus (FileMaker Pro Advanced) and Adding tooltips on layouts.
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