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feat: rework is_bipartite to do an actual bipartivity check #1729

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feat: rework is_bipartite to do an actual bipartivity check #1729

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acc8b31
reworked is_bipartite
schochastics Feb 28, 2025
332110c
switch or to and
schochastics Feb 28, 2025
cf2f0b6
add ensure_igraph back
schochastics Feb 28, 2025
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24 changes: 23 additions & 1 deletion R/attributes.R
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Original file line number Diff line number Diff line change
Expand Up @@ -1008,9 +1008,31 @@ is_weighted <- function(graph) {
is_bipartite <- function(graph) {
ensure_igraph(graph)

"type" %in% vertex_attr_names(graph)
has_type_attr <- "type" %in% vertex_attr_names(graph)

bipartite_result <- bipartite_mapping(graph)

if (has_type_attr) {
if (!bipartite_result$res) {
cli::cli_warn("{.arg graph} has a type attribute but is not actually bipartite.")
FALSE
} else {
if (!all(bipartite_result$type == vertex_attr(graph, "type")) & !all(bipartite_result$type == !vertex_attr(graph, "type"))) {
cli::cli_warn("{.arg graph} is bipartite but has a wrong 'type' vertex attribute. You can correct it using:\n {.code V(graph)$type <- bipartite_mapping(graph)$type}")
}
TRUE
}
} else {
if (bipartite_result$res) {
cli::cli_warn("{.arg graph} is bipartite but has no 'type' vertex attribute. You can add it using:\n {.code V(graph)$type <- bipartite_mapping(graph)$type}")
TRUE
} else {
FALSE
}
}
}


#############

igraph.i.attribute.combination <- function(comb) {
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