add_mixed_layout        Add a layout column to long format data for
                        mixed layouts.
cor_long                Make a correlation matrix from long format
                        data.
ggcorrhm                Make a correlation heatmap with ggplot2.
ggcorrhm_tidy           'ggcorrhm()' for long format data.
gghm                    Make a heatmap with ggplot2.
gghm_tidy               'gghm()' for long format data.
