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A.4.7 Histogram Plot Window

Histogram Plot Window

Histogram Plot Window

The Histogram Plot () plots 1-dimensional histograms. In many respects it is like the Plane Plot, but it has an additional fixed control Bars and the scrolling works a bit differently.

See the Window Overview for features common to all plotting windows.

The following non-standard action is available from the toolbar as well as the Plot menu:

Rescale Y
Adjusts the vertical range of the visible data region to accommodate all the histogram bars in the currently visible horizontal region of the plot. The horizontal range is not changed.

In addition, the histogram window lets you export the binned data as a new table, either saving it or loading it directly into TOPCAT's table list. The following actions are available in the Export menu:

Save as Table
The bin counts/sums corresponding to the currently plotted histogram will be written to disk in tabular form. The first two columns give the lower and upper bounds of each bin, and the subsequent columns give the occupancies of each bin for each plotted data set. If only one dataset is plotted, there will only be three columns.
Import as Table
Assembles a table as per the Save option above, but rather than writing it to disk imports it directly into TOPCAT, where it can be manipulated in all the usual ways.

The following subsections describe navigation, axis configuration and bar configuration.

The Histogram Plot offers only the following plot controls:


Next Previous Up Contents
Next: Histogram Navigation
Up: Plot Windows
Previous: Aux Mode

TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@bristol.ac.uk