Column and Cell Formulas
A column or cell formula is a mathematical expression that applies to a data
table column or cell. To apply a formula to the selected column or cell,
select the Set Formula menu command on the Data
menu to open the Column/Cell Formula dialog box
with which a formula can be created and applied. Column or cell formulas can be
reapplied to the corresponding columns or cells by selecting the Column Formulas
tool or the Cell Formulas tool on the ToolBox.
DataScene takes care to evaluate column formulas: it first checks whether the
column formulas form a circular condition: a
condition where a column formula depends on another column formula that is directly or
indirectly depends on the former. If such a condition is found, DataScene issues
an error message and stops the formula evaluation. Otherwise, DataScene
the column formulas in a correct way that satisfies the dependencies among the column
formulas. It is important to note that no such checks are performed in evaluating cell formulas.
If a column formula contains the time parameter T, it is called a
time-dependent formula and the data table is called a time-dependent data
table. A series
that use a time-dependent data table as its data source is called a
time-dependent series. If a graph contains at least one time-dependent series,
the graph is called a time-dependent graph and its parent graph
document is called a time-dependent graph document.
Graph animation can be generated using time-dependent data tables, please refer
to the topic Animation through Time Travel