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A.3.2 Parameters Window

Parameters Window

Parameters Window

The Parameters Window displays metadata which applies to the whole table (rather than that for each column). You can display it using the Table Parameters () button when the chosen table is selected in the Control Window's Table List.

In table/database parlance, an item of per-table metadata is often known as a "parameter" of the table. The number of rows and columns will always be listed; some table file formats don't have facilities for storing other table parameter metadata, so there may not be much of interest displayed in this window.

The display is a JTable with one row for each parameter. It indicates the parameter's name, its value, the type of item it is (integer, string etc) and other items of interest such as units, dimensionality or UCD if they are defined. If a column of the table has no entries (for instance, the Units column might be empty because none of the parameters has had units defined for it) then that column may be absent from the display - in this case the Display menu can be used to reveal it.

You can edit some parameter values and descriptions by double-clicking on them as usual.

The following items are available in the toolbar:

Add Parameter
Pops up a New Parameter Window to allow you to add a new parameter to the table.
Remove Parameter
If one of the parameters displayed in the JTable in this window has been selected by clicking on its row, then clicking this button will remove it. You will be prompted before the removal takes place. Some parameters such as Row Count cannot be removed.


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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note 253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk