Remove cached versions of
dodgr graphs. This function should generally
not be needed, except if graph structure has been directly modified
other than through
dodgr functions; for example by modifying edge weights
or distances. Graphs are cached based on the vector of edge IDs, so manual
changes to any other attributes will not necessarily be translated into
dodgr output unless the cached versions are cleared using this
for details of caching process.
Nothing; the function silently clears any cached objects
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