addInterval             Draw intervals or arrows on plots.
add_bars                Adding bars to an existing plot.
add_n_points            Add rug to plot, based on model.
alpha                   Adjusting the transparency of colors.
alphaPalette            Manipulate the transparency in a palette.
check_normaldist        Compare distribution of data with normal
                        distribution.
color_contour           Creates a contour plot with colored background.
dotplot_error           Utility function
drawArrows              Draw arrows between different plots.
emptyPlot               Utility function
errorBars               Add error bars to a plot.
fill_area               Utility function
findAbsMin              Return the value (or the element with the
                        value) closest to zero.
find_n_neighbors        Return n neighbors around given indices.
getCoords               Convert proportions into coordinates of the
                        plot or figure region.
getDec                  Return the number of decimal places.
getFigCoords            Get the figure region as coordinates of the
                        current plot region, or as corrdinates of the
                        figure region.
getProps                Transform coordinates into proportions of the
                        figure or plot region.
getRange                Function for rounding and/or segmenting a
                        range.
gradientLegend          Add a gradient legend to a plot.
group_sort              Sort split by grouping predictor.
legend_margin           Add legend with respect to figure instead of
                        plot region.  Allows to move legend to margin
                        of plot.
list2str                Combine list values as string.
marginDensityPlot       Plot density of distribution in margins of the
                        plot.
move_n_point            Move a vector n elements forward or backward.
plot_error              Utility function
plot_image              Add images to plots.
plotfunctions           Package plotfunctions: Various Functions to
                        Facilitate Visualization of Data and Analysis
plotsurface             Creates a colored surface plot from data frame
                        input.
se                      Calculate standard error of the mean.
