UKEnergy2000            Energy consumption in the UK in 2000
add_UKEnergy2000_matnames
                        Add a column of matrix names to tidy data frame
add_UKEnergy2000_row_col_meta
                        Add row, column, row type, and column type
                        metadata
collapse_to_matrices    Collapse a "tidy" data frame to matrices in a
                        data frame ('matsindf')
df_to_msg               Create a message from a data frame
everything_except       Get symbols for all columns except ...
expand_to_tidy          Expand a "tidy" data frame with matsindf-style
                        matrices to a "tidy" data frame with each
                        matrix entry as an observation
group_by_everything_except
                        Group by all variables except some
index_column            Index a column in a data frame by groups
                        relative to an initial year
mat_to_rowcolval        Convert a matrix to a data frame with rows,
                        columns, and values.
matsindf_apply          Apply a function to a 'matsindf' data frame
                        (and more)
matsindf_apply_types    Determine types of '...' argument for
                        matsindf_apply
rowcolval_to_mat        Collapse a tidy data frame into a matrix with
                        named rows and columns
verify_cols_missing     Verify that column names in a data frame are
                        not already present
