[igraph] Re: Hello

[Walk to Sun]

Dear Dr Gábor Csárdi ,

 

I am glad to read your reply. Your explaination is very helpful and very clear.

 

In order to generate a random graph with each node representing a district,  what data should I collect ?  Data which can repersent relation and attributes?  Do I need to calculate betweenness  or in/Out degree before loading data into R? 

 

Besides, I cannot run the program in below pages. Where can I download dataset?

http://cneurocvs.rmki.kfki.hu/igraph/screenshots2.html#10

> library(igraph)
> library(Cairo)
>
> graphs <- frgraphs()
Error: could not find function "frgraphs"
> lay <- lapply(graphs, layout.fruchterman.reingold, niter=3000)
Error in is.vector(X) : object "graphs" not found
>
> CairoX11()
Error in Cairo(width, height, file = display, type = "x11", pointsize = pointsize,  :
  cairo library was compiled without XLIB back-end.
> # CairoPNG(file="frplots.png")
> par(mai=c(0,0,0,0))
> layout(matrix(1:16, nr=4, byrow=TRUE))
> layout.show(16)
> for (i in seq(along=graphs)) {
+   plot(graphs[[i]], layout=lay[[i]],
+        vertex.label=NA, vertex.size=13, edge.color="black",
+        vertex.color="red")
+ }
Error in seq(along = graphs) : object "graphs" not found
> # dev.off()

 

Thank you for your time.

 

Best regards

W

 

----- Original Message -----

From: "Gábor Csárdi" <address@hidden>

To: "Walk to Sun" <address@hidden>

Cc: <address@hidden>

Sent: Wednesday, February 11, 2009 6:44 PM

Subject: Re: Hello

Dear W,

On Wed, Feb 11, 2009 at 9:26 AM, Walk to Sun <address@hidden> wrote:
> Dear Dr Gábor Csárdi ,
>
> Is that possible to use below data to make distribution estimaiton?

I am sure that it is, but why is this an igraph question? See e.g.
?fitdistr in the MASS package.

> How to
> arrange data?

To load it into igraph? I don't know, where is the graph in your data?

> How to calculate  In/Out degree,

?degree

> Size,

I don't know what this is to be honest.

> Density,

?graph.density

> Betweenness,

?betweenness

> Centrality,

Which centrality?

> Closeness ?

?closeness

Perhaps, you could try using ?help.search, e.g.
help.search("betweenness") tells you how to calculate betweenness. Or
use the R igraph manual pages at
http://cneurocvs.rmki.kfki.hu/igraph/doc/R/00Index.html

G.

>
> district  vairable 1  variable 2
> 1 3370.86 0.29
> 2 3881.64 0.29
> 3 4465.13 0.29
> 4 5742.33 0.29
> 5 5069.75 0.29
> 6 6628.07 0.29
> 7 7753.61 0.29
> 8 6238.07 0.29
> 9 3881.64 0.29
> 10 7753.61 0.29
> 11 3881.64 0.29
> 12 5069.75 0.29
> 13 3881.64 0.29
> 14 5742.33 0.29
> 15 5069.75 0.29
> 16 3628.07 0.30
> 17 4465.13 0.30
> 18 5742.33 0.30
> 19 5069.75 0.30
> 20 6628.07 0.30
> 21 7753.61 0.30
> 22 4559.77 0.30
>
>
> Thanks
>
> W



--
Gabor Csardi <address@hidden>     UNIL DGM