A.2.3 Toolbar Buttons

The following buttons deal with table import and export:

Load Table
Pops up the Load Table dialogue which allows you to load a table into TOPCAT. If a table is loaded it becomes the new current table.
Save Table
Pops up the Save Table dialogue which allows you to write out the current Apparent Table.
Duplicate Table
Adds a new copy of the current Apparent Table to the list of known tables. This is like loading in the current table again, except that its apparent characteristics become the basic characteristics of the copied one, so for instance whatever is the current row order becomes the natural order of the new one.

The following buttons display various views of the current table; these views are described in more details in Appendix A.3.

Data Window
Displays the table rows and columns in a scrollable viewer so you can see the cell contents themselves.
Parameters Window
Displays table "parameters", that is metadata which applies to the whole table.
Columns Window
Displays metadata about each column such as data type, units, description, UCDs etc.
Subsets Window
Displays the currently defined row subsets and enables new ones to be defined.
Statistics Window
Displays a window for calculating statistical quantities for the values in each column of the table.
Plot window
Permits plotting of columns against each other.

The following buttons deal with matching and joining tables (see Section 4 for discussion of these functions):

Concatenation Window
Displays a dialog for joining tables top-to-bottom.
Internal Match Window
Displays a dialog for finding internal matches between the rows of a table.
Pair Match Window
Displays a dialog for joining tables side-by-side by locating rows which match between them.

The following buttons are miscellaneous:

Available Functions Window
Displays a window containing all the functions which can be used for writing algebraic expressions (see Section 6).