[igraph] vcount(g) and V(g) with missing items

[Knut Krueger]

Hi to all,
I have a second observation with missing items
f.e
first observation

max_items <- 10

[0] 0 -- 1
[1] 1 -- 2
[2] 2 -- 3
[3] 3 -- 4
[4] 4 -- 5
[5] 5 -- 6
[6] 6 -- 7
[7] 7 -- 8
[8] 8 -- 9
[9] 0 -- 9

second observation with missing item 3

max_items <- 9
[0] 0 -- 1
[1] 1 -- 2
[2] 4 -- 5
[3] 5 -- 6
[4] 6 -- 7
[5] 7 -- 8
[6] 8 -- 9
[7] 0 -- 9

g <- graph.empty(n=max_items, directed=TRUE)

g <- graph( igraph_data,n=max_items, directed=TRUE )
vcount(g)
vcount is calulating  10 items


V(g)$color <-  heat.colors(max_items)

V(g)$color has 10 items

and I would need 9 items

What could i do to omit item nr 3

Kind regards Knut

.. I hope I explained the problem understandable