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13.3.2 Adding data via an equation
When selecting the “Add Equation” menu from the data panel, a dialog box appears where the user can enter the name of the new data field and a mathematical expression that will be evaluated over the entire mesh.
Currently, this only allows the creation of scalar nodal data (Type float, Class NODE, Format ITEM).
You can use the symbols , , and to reference the (time dependent) nodal coordinates, and to reference time.