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The **Algebraic Subset From Visible**
() action
(available in the **Subsets** menu of the
Plane and Cube
plot windows)
creates subsets containing all of the points that are visible
on the current plot.
The subset content of this is the same as for the
Subset From Visible action,
but this action defines the subset as an algebraic expression
based on the axis limits
rather than just marking the points that can currently be seen.
This can be more useful, for instance if you want to use the
subset definition in some other context.
However, it is only available for some plot types (Plane and Cube),
since in other cases the rectangular visibility
region does not correspond to a straightforward algebraic expression.

When you hit this button, the Multi Algebraic Subset Window will be displayed, showing the algebraic function(s) corresponding to the currently visible region, and offering to create a new subset (or, if there are multiple datasets plotted, several new subsets) from it.

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Starlink User Note253

TOPCAT web page: http://www.starlink.ac.uk/topcat/

Author email: m.b.taylor@bristol.ac.uk

Mailing list: topcat-user@jiscmail.ac.uk