These functions/data matricies are examples of what can be passed as the symb argument in the my.symbols function. They are provided both to be used for some common symbols and as examples of what can be passed as the symb argument.
This package provides various demonstrations that can be used in classes or by individuals to better learn statistical concepts and usage of R. Various utility functions are also included
TkApprox
(Package: TeachingDemos) :
Plot a set of data in a Tk window and interactively move lines to
This function plots a dataset in a Tk window then places 3 lines on the plot which show a predicted y value for the given x value. The lines can be clicked on and dragged to new x-values with the predicted y-values automatically updating. A table at the bottom of the graph shows the differences between the pairs of x-values and y-values.
This function draws symbols on a plot. It is similar to the builtin symbols function with the difference that it plots symbols defined by the user rather than a prespecified set of symbols.
zoomplot
(Package: TeachingDemos) :
Zoom or unzoom an existing plot in the plot window
This function allows you to change the x and y ranges of the plot that is currently in the plot window. This has the effect of zooming into a section of the plot, or zooming out (unzooming) to show a larger region than is currently shown.
TkPredict
(Package: TeachingDemos) :
Plot predicted values from a model against one of the predictors
These functions create a plot of predicted values vs. one of the predictors for given values of the other predictors. TkPredict further creates a Tk gui to allow you to change the values of the other predictors.
providing 
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