QlikView Reference Manual.pdf - QlikCommunity - QlikView

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There are also Automation APIs for extracting and setting values programmatically.
22.3 Variable
A variable in QlikView is a named entity, containing a single data value. A variable typically acquires its
value from a Let, Set or other control statement, via an automation call or via an Input Box (page 519) in
the layout. The value of a variable can normally be changed by the user at any time.
Variables can contain numeric or alphanumeric data. If the first character of a variable value is an equals
sign ' = ' QlikView will try to evaluate the value as a formula (QlikView expression) and then display or
return the result rather than the actual formula text.
22.4 Other Entities in QlikView
Chart Dimensions
A chart dimension is the set of values for the chart to iterate over when it calculates the values for its expression(s).
In the simple case one could say that it is what appears on the x-axis in a standard bar chart.
A chart can have one or more dimensions. The upper limit depends on chart type, data complexity and the
amount of memory available. Pie, line and scatter charts can show a maximum of two dimensions, bar and
grid charts three. Radar charts can only show one dimension, gauge charts show no dimensions at all.
In general a chart dimension gets its values from a field which is specified on the Dimensions page of the
Chart Properties dialog. Instead of being a single field a dimension can also consist of a group of fields (see
Groups below).
Chart dimensions may also be calculated from an expression.
Groups
Groups, or more correctly field groups, are collections of fields, which can be used instead of fields as chart
dimensions. There are two types of field groups:
Drill-down groups are used to create hierarchies of fields allowing so called drill-down in charts.
Cyclic groups are non-hierarchical and are normally used just as a convenient way of letting the user switch
chart dimension fields by a simple mouse click.
Groups are specified on the Document Properties: Groups page.
Expressions (Calculated Formula)
An expression consists of a combination of fields, variables, operators and functions put together according
to a special syntax. The functions available vary slightly between script, charts and other parts of the layout.
In the script the expression will be evaluated as the script execution passes it by. In charts and other layout
objects expressions will be evaluated automatically whenever any of the fields, variables or functions that
the expression contains changes value or logical status.
For more information about script expressions see Script Expressions (page 283).
For more information about chart expressions see chapter Chart Expressions (page 765).
For more information about the use of expressions in other layout objects see chapter Calculated Formulas
(page 851).
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