internal function to get the indices of the <code>tidy_dist_mat</code> related to a data frame.

internal function to get the indices of the tidy_dist_mat related to a data frame.

process_df_index(x, index, margin = 1)

Arguments

x	`tidy_dist_mat` object
index	data.frame style index related to `x`
margin	scalar representing if `index` is related to rows or columns of `x`. 1 = row, 2 = column.

index vector