Remove old next_row function.

R/next-row.R

@@ -1,42 +1,3 @@
-#' Find a compatible row for extending a latin rectangle
-#'
-#' Given an input latin rectangle this function will
-#' generate a new row that can be added to the latin
-#' rectangle.
-#'
-#' The method used is to create a bipartite graph
-#' with vertex partitions for columns and symbols
-#' missing from columns and then find a maximum
-#' matching in that bipartite graph.
-#'
-#' @param R A latin square
-#' @param l_order The order of the input latin square
-#'
-#' @return A bipartite graph.
-next_row <- function(R, l_order) {
-  bg <- to_tidygraph(R, l_order)
-
-  m <- igraph::max_bipartite_match(bg)
-
-  # names of edges in the matching
-  matching_names <- match(m$matching, names(m$matching))
-
-  # add a matching indicator to the edges
-  bg <- bg |>
-    tidygraph::activate(edges) |>
-    dplyr::mutate(
-      matching = to == matching_names[from]
-    )
-
-  # just the matching itself, as a graph
-  mg <- bg |>
-    tidygraph::activate(edges) |>
-    dplyr::filter(matching)
-
-  EE <- igraph::ends(mg, igraph::E(mg))
-  return(as.numeric(gsub("s", "", EE[,2])))
-}
-
 #' Find a random new row for a latin rectangle
 #'
 #' @param R A latin rectangle