igraph graphs cache some basic properties (such as whether the graph is a DAG or whether it is simple) in an internal data structure for faster repeated queries. This function invalidates the cache, forcing a recalculation of the cached properties the next time they are needed.
Value
The graph with its cache invalidated. Since the graph is modified in place in R as well, you can also ignore the return value.
Details
You should not need to call this function during normal usage; however, it
may be useful for debugging cache-related issues. A tell-tale sign of an
invalid cache entry is when the result of a cached function (such as
is_dag() or is_simple()) changes after calling
this function.
Examples
g <- make_ring(10)
# Cache is populated when calling is_simple()
is_simple(g)
#> [1] TRUE
# Invalidate cache (for debugging purposes)
invalidate_cache(g)
#> ── <igraph> Ring graph ────────────────────────────────────────────── 6b63d0e ──
#> ℹ undirected
#> ℹ 10 vertices · 10 edges
#>
#> ── Attributes ──────────────────────────────────────────────────────────────────
#> → graph: name <chr>, mutual <lgl>, circular <lgl>
#>
#> ── Edges ───────────────────────────────────────────────────────────────────────
#> [1] 1 ─ 2 2 ─ 3 3 ─ 4 4 ─ 5 5 ─ 6 6 ─ 7 7 ─ 8 8 ─ 9 9 ─ 10
#> [10] 1 ─ 10
# Result should be the same
is_simple(g)
#> [1] TRUE