The Histogram layer control (),
allows you to make a 1-dimensional histogram-like plots
(weighted and unweighted histograms, various kinds of Kernel Density Estimates).
It is the main control in the
Histogram plot window,
but is also available in the Plane
and Time
plot windows, so you can overplot a histogram on scatter or time plots,
if you can think of some reason to do that.
The Histogram window starts off with one of these controls in the stack by
default, but as usual you can add more by using the
Add Histogram Control (
) button
in the control panel toolbar,
or the corresponding item in the Layers menu.
Each instance of this control in the stack can make histogram-like plots of a particular quantity from a particular table. The value to be histogrammed, and optionally an associated weighting term, are defined in the Positions tab using column names or expressions. However, the control can generate multiple layers from these coordinates; the Subsets tab controls which subsets are plotted and how each one is identified, and the Form tab provides many options for what graphics will be plotted based on the sample values specified in the Position tab.
This control is a Table Data control as described in Appendix A.4.2.2. That section explains the Subsets tab; the Position and Form tabs are described in more detail below.
Histograms have some additional configuration items,
as described in the
Bins ()
fixed control.
When a histogram layer control is used in the
Histogram window,
those configuration items are found in the
Bins fixed control, where they control the settings
for all the histogram layers in the plot.
However, if you use a histogram layer in a
Plane plot,
those items will appear as additional items in the Form tab
and can be controlled separately for each histogram.