| 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 |
| matsindf_apply | Apply a function to a 'matsindf' data frame (and more) |
| matsindf_apply_types | Determine types of '...' argument for matsindf_apply |
| mat_to_rowcolval | Convert a matrix to a data frame with rows, columns, and values. |
| rowcolval_to_mat | Collapse a tidy data frame into a matrix with named rows and columns |
| UKEnergy2000 | Energy consumption in the UK in 2000 |
| verify_cols_missing | Verify that column names in a data frame are not already present |