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 e3cc625 U--- 10 10 -- Ring graph
#> + attr: name (g/c), mutual (g/l), circular (g/l)
#> + edges from e3cc625:
#> [1] 1-- 2 2-- 3 3-- 4 4-- 5 5-- 6 6-- 7 7-- 8 8-- 9 9--10 1--10
# Result should be the same
is_simple(g)
#> [1] TRUE