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We begin with the familiar two dimensional point cloud.
Point cloud layout is the positioning of each constituent point symbol
according to values for the x and y variates.
Positioning is carried out in the coordinate system of the variates
themselves.
When the point cloud is drawn, the point symbol locations in variate
coordinates
are transformed into viewport locations in screen coordinates.
Thereafter we describe
layouts where views are positioned within a bounding region
in some abstract coordinate system.
Views such as the 2d-pointcloud that require two values per case
are collectively known as 2-d views.
Other examples of 2-d views are the lines-view, which has line segments
connecting consecutive pairs of coordinates, ordered by the x values, the
fitted-line, which uses the coordinates to compute a (by default,
least squares)
fitted line, and a smooth.
Similarly, views such as a histogram-view and a boxplot-view,
which use one coordinate per case are collectively known as 1-d views
and a rotating-point-cloud is a 3-d view.
In summary, a p-d view is a view that given a dataset and p variates,
calculates
p values per case.
Next: Plot Layout
Up: ORGANISING INFORMATION GRAPHICALLY
Previous: ORGANISING INFORMATION GRAPHICALLY
2000-01-28