Graphics Reference
In-Depth Information
a memoryless system. In a memoryless system, no history is kept of previous selec-
tions; only the current degree of interest is kept track of, with no knowledge of how
that state wasachieved. huswhenaselection interaction isperformed,only thepre-
vious degree of interest and the view selection are used to create the resulting degree
ofinterest. Bycontrast, inasystemwith memory,each selection operation isremem-
bered and changing one selection runs through all existing selection operations to
determine the final selection. An example is Ahlberg and Shneiderman's implemen-
Figure
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Multiple linked views with memory. he let barcharts show counts of number of players
by fielding position and by year. he scatterplot shows the relationship between putouts and assists -
two measures of fielding effectiveness. he user has selected sections of both barcharts independently;
in each chart the bars corresponding to that selection are displayed with a hash pattern.hetop let
view has the catcher (C) position selected; the lower view has years before
selected. he
intersection of those selection states defines the degree of interest, which is displayed in all views in
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