Define an Attribute by Formula Using the Collection’s Inspector

How To... > Work with Collections > Define an Attribute by Formula Using the Collection’s Inspector

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There are many reasons to create attributes defined by formula. Maybe you are basing an attribute on other attributes (such as multiplying height times width to compute areas), generating random values, or recoding data.

1.	In the Cases panel of the collection’s inspector, double-click the attribute’s formula cell to show the formula editor.

2.	Enter the formula telling Fathom how to compute the attribute’s values and press Enter or Return to accept the formula and close the formula editor.

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Warning: Defining a formula for an attribute that already has values will replace those values with the formula’s results. To compute values based on an attribute, add a new attribute and define it by formula.