[BioC] finding cliques with packages Graph and RBGL

[Bagatti Davide]

Hi Li,

thanks for your answer.
I cannot send you the full dataset, because it is a MySQL database of
various MBs of size, but in the file "data.zip" in attach you find four
files with the adjacency matrix (NOTE: for a direct graph, so, for example,
40 19 means there is a link between node 40 and node 19) for package "Graph"
in four temporal steps (note: these steps are consecutive) where I found
what I described in my first e-mail (but it also happens in other
intervals).
The first file ("network1.txt"), maxclique found cliques of length 19, in
the second and third file ("Network2" and "network3") the maximum clique
found has length 1. In the fourth file ("network4") length 19.
I also send you  the plot of some network indicator:
network density ("densita.png")
number of active node ("numero_agenti_vivi.png")
The total step are 500; the adjacency matrices I sent you are relative at
steps 429-430-431-432
Thanks in advance

Davide


2006/12/18, lilong at isb-sib.ch <lilong at isb-sib.ch>:
>
>
> Hi,
>
> Could you provide the dataset?  Without any further info, it's hard to
> judge the results, especially the graph changes dynamically.  For instance
> it's possible that at SOME stage, there is no bigger clicks.
>
> If you provide a graph that shows the behaviour (that particular graph),
> we could help further.
>
> Thanks
>
> Li
>
> > Hello everyone,
> >
> > I am using packages Graph and RBGL 1.8 with R 2.3.1 for finding cliques
> in
> > a
> > undirected dynamical graph (it changes over time).
> > What I do: I load data (adjacency matrix for Graph) from database in a
> > temporal step.
> > I transform the matrix in a direct graph using ftM2graphNEL, I make some
> > analysis (like "degree"), then I transform the
> > direct graph in a undirect graph using "ugraph" to use maxClique to find
> > all
> > the cliques in this graph (which now is undirect).
> > But I found a problem: in some steps the output of maxClique give me
> only
> > clique of length one...but it is a graph with density
> > near at 1! In the step before it gives me one or two cliques of lenght
> 27
> > or
> > 28 (the node in the graph are 29).
> > I give you some outputs:
> >
> > step "Before":
> >
> > $maxCliques
> > $maxCliques[[1]]
> >  [1] "1"  "3"  "6"  "7"  "8"  "9"  "11" "12" "14" "16" "17" "18" "19"
> "20"
> > "21"
> > [16] "24" "25" "27" "30" "31" "32" "35" "36" "37" "39" "40" "33" "26"
> >
> > $maxCliques[[2]]
> >  [1] "1"  "3"  "6"  "7"  "8"  "9"  "11" "12" "14" "16" "17" "18" "19"
> "20"
> > "21"
> > [16] "24" "25" "27" "30" "31" "32" "35" "36" "37" "39" "40" "22"
> >
> > the degree (in the undirected graph) of each node is (node are number
> from
> > 1
> > to 40, but in time some node (e.g.  node 2) "dies"):
> >
> >  1  3  6  7  8  9 11 12 14 16 17 18 19 20 21 22 24 25 26 27 30 31 32 33
> 35
> > 36
> > 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28 26 28 28 27 28 28 28 28 27
> 28
> > 28
> > 37 39 40
> > 28 28 28
> >
> > and in the "next" step the output is the following:
> >
> > $maxCliques
> >       [,1] [,2]
> >  [1,] "1"  "1"
> >  [2,] "3"  "3"
> >  [3,] "6"  "6"
> >  [4,] "7"  "7"
> >  [5,] "8"  "8"
> >  [6,] "9"  "9"
> >  [7,] "11" "11"
> >  [8,] "12" "12"
> >  [9,] "14" "14"
> > [10,] "16" "16"
> > [11,] "17" "17"
> > [12,] "18" "18"
> > [13,] "19" "19"
> > [14,] "20" "20"
> > [15,] "21" "21"
> > [16,] "24" "24"
> > [17,] "25" "25"
> > [18,] "26" "26"
> > [19,] "27" "27"
> > [20,] "30" "30"
> > [21,] "31" "31"
> > [22,] "32" "32"
> > [23,] "35" "35"
> > [24,] "36" "36"
> > [25,] "37" "37"
> > [26,] "39" "39"
> > [27,] "40" "40"
> > [28,] "33" "22"
> >
> > The number of node in each cliques in always 1.
> >
> > degree:
> >  1  3  6  7  8  9 11 12 14 16 17 18 19 20 21 22 24 25 26 27 30 31 32 33
> 35
> > 36
> > 28 28 28 28 28 28 28 28 28 28 28 28 28 28 28 27 28 28 28 28 28 28 28 27
> 28
> > 28
> > 37 39 40
> > 28 28 28
> >
> > Some ideas?
> > Thank-you very much.
> >
> > Sorry for my english.
> >
> > Davide
> >
> >       [[alternative HTML version deleted]]
> >
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