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
build_keep_args         Build a list of arguments to keep
build_matsindf_apply_data_frame
                        Create a data frame consisting of the input
                        data for matsindf_apply()
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 'matsindf' data frame
get_useable_default_args
                        Create a usable list of default arguments to a
                        function
group_by_everything_except
                        Group by all variables except some
handle_empty_data       Gracefully handle empty data
handle_null_args        Gracefully handle 'NULL' arguments
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.
matrix_cols             Find columns that contain matrices
matsindf_apply          Apply a function to a 'matsindf' data frame
                        (and more)
matsindf_apply_types    Determine types of '.dat' and '...' arguments
                        for matsindf_apply()
rowcolval_to_mat        Collapse a tidy data frame into a matrix with
                        named rows and columns
should_unlist           Tell whether a column can be unlisted
verify_cols_missing     Verify that column names in a data frame are
                        not already present
where_to_get_args       Decide where to get each argument to FUN
