int igraph_arpack_storage_init(igraph_arpack_storage_t *s, long int maxn,
			       long int maxncv, long int maxldv, 
			       igraph_bool_t symm);

You only need this function if you want to run multiple eigenvalue calculations using ARPACK, and want to spare the memory allocation/deallocation between each two runs. Otherwise it is safe to supply a null pointer as the storage argument of both igraph_arpack_rssolve() and igraph_arpack_rnsolve() to make memory allocated and deallocated automatically.

Don't forget to call the igraph_arpack_storage_destroy() function on the storage object if you don't need it any more.

Arguments: 

Returns: 

Time complexity: O(maxncv*(maxldv+maxn)).