get_row_col_index_maps: Figure out row and column index maps

In matsbyname: An Implementation of Matrix Mathematics that Respects Row and Column Names

Figure out row and column index maps

Description

The index_map argument can take several forms. This function figures out (for a given a_mat) the index maps for rows (first data frame in the return list) and columns (second data frame in the return list).

Usage

get_row_col_index_maps(a_mat, ind_maps)

Arguments

a_mat	A matrix for which index maps should be determined.
ind_maps	A single data frame or a list of two or more data frames of potential index maps.

Details

ind_maps can be a single data frame, in which case the single data frame will be applied to both rows and columns of a_mat.

ind_maps can also be a 2-item list, in which case the first item is applied to rows and the second item is applied to columns.

Finally, ind_maps can be a named list of length 2 or more, in which case the names are interpreted as row or column types. Names in the ind_maps list are matched to row and column types and applied as required.

This is a non-exported function meant only for internal use.

Value

A list of two data frames. The first data frame is the index map for the rows of a_mat. The second data frame is the index map for the columns of a_mat.

matsbyname documentation built on June 8, 2025, 10:08 a.m.