colorRamp2              A faster implementation of grDevices::colorRamp
                        for linear interpolation.
colorkey                Function to create a color key
locate_vertex           Find a vertex in the current plot
make_colors             Create a vector of colors for vertices and
                        edges
netplot-formulae        Formulas in 'netplot'
nplot                   Plot a network
nplot_base              'nplot' using base graphics
nplot_legend            Add legend to a netplot object
npolygon                n-sided polygons Calculate the coordinates for
                        an nsided polygon
piechart                A flexible piechart.
segments_gradient       Draw segments colored by gradients
set_gpar                Set/retrieve graphical parameters of a
                        'netplot' object
