Displaying 20 results from an estimated 4000 matches similar to: "Curved arrows"
2009 Apr 06
5
Search for a graph package - see link
Hi to all,
does anybody knows whether there is a package to plot those
http://www.equine-science.de/temp/graph.jpg
graphs.
the thickness of the points and/or the lines should be represent the
numbers of behaviours
With kind regards Knut
2009 Mar 06
2
Highly Connected Nodes in Igraph
Hello R Help Team,
I have created graph from weighted adjecency matrix .Is there a way I can
find highly connected nodes in Igraph like the Package RBGL does.
nathan
--
View this message in context: http://www.nabble.com/Highly-Connected-Nodes-in-Igraph-tp22377522p22377522.html
Sent from the R help mailing list archive at Nabble.com.
2008 Dec 26
2
question about SNA in R, thanks!
Dear colleagues,
I'm trying to have a look at the Assortative and Disassortative (
http://en.wikipedia.org/wiki/Assortative_mixing) of the network I have.
But it seems that the igraph hasn't mentioned that yet.
I have to get the in/out degree of the vertices of each edge and calculate
the Pearson's Correlation coefficient which seems to be quite a huge task
for me. :(
So I wonder if
2009 Apr 07
2
Minimum Spanning Tree
Hi all, I'm very new to R and read a few tutorials, however I'm having
difficulty trying to figure out how to plot a minimum spanning tree. I have
a csv file that contains an n-by-n matrix of distances between strains of
bacteria called matrix.csv.
Looks like:
id,strain1, strain2,strain3
strain1,0,.2,.8
strain2,.3,0,.7
strain3,.4,.6,0
I've been messing around with some information
2008 Jul 11
2
network
Hello
I am a relatively new user of R and am struggling to use the 'network' package. I have a correlation matrix (produced using 'cor'), and want to draw a network where each item showing correlation above a threshold (say 0.5) is joined by a green line, and each item showing correlation below a threshold (say -0.5) is joined by a red line. Does anyone have any hints of how to
2009 Aug 17
1
FYI conflict between statnet, igraph
Dear R users:
There appears to be a conflict between the statnet package and the
igraph package.
With igraph loaded into memory, the network() function of statnet
failed, returning the error to the effect that the matrix being
converted was "not a graph object." Removing igraph from memory restored
statnet to proper function.
Apologies if this is redundant. I could not find this
2009 Dec 04
1
R igraph clusters component
Hi R-users,
I'm using igraph for an undirected graph.
i used clusters() igraph function to know the component size(subgraphs) as shown bellow:
c <-clusters(g)
# component sizes
size <- sort(c$csize, decreasing=TRUE)
cat("Top 20 cluster of the graph","\n")
for (i in 1:20)
{
cat(i," size:",size[i] ,"\n")
}
Can anyone help how to extract the
2008 Mar 05
4
vertex labels in igraph from adjacency matrix
I am getting some unexpected results from some functions of igraph and
it is possible that I am misinterpreting the vertex numbers. Eg., the
max betweenness measure seems to be from a vertex that is not connected
to a single other vertex. Below if my code snippet:
require(igraph)
my.graph <- graph.adjacency(adjmatrix = my.adj.matrix, mode=c("undirected"))
most.between.vert <-
2008 Nov 30
1
about centralization
Hi all,
Is there anyone who ever used igraph to calculate the index of
"centralization" ?
I tried my best but can't find it in igraph.
The brief introduction to "centralization" can be found here , and I think
it's an important index for measuring the centrality on the aggregated
level.(http://faculty.ucr.edu/~hanneman/nettext/C10_Centrality.html)
Thank you for any
2009 Sep 08
1
Point patterns and igraph
Hi,
I have a data set consisting of the x and y coordinate locations of 1600
points. I would like to generate a graph using the functions in igraph.
However the graph making functions in igraph requires the data to be in the
form of an adjacency matrix. I'd like some advice on how to convert my point
pattern to an adjacency matrix or functions out there that would do it
directly. I've
2011 Jan 31
1
httpd-access.log parsing and graph construction.
R gurus:
I'm thinking about using R for website traffic analysis but didn't find anything in my web searches specific to R.
If I have the webpages (simple example would contain something like three (3) static pages with a couple of links each) and parse the apache access log file (httpd-access.log), then I can populate the graph representing the website and perform whatever analysis I
2009 Mar 19
1
Minimum cutsets
The minCut function in RBGL package returns only a value or the minimum cut. I would be
really greatful if any knows of any R function or package available for
finding all minimal cut sets ( i.e., components whose failure will
results in a network failure) between any given pair of vertices.
2008 May 09
3
For Social Network Analysis-Graph Analysis - How to convert 2 mode data to 1 mode data?
Hi,
Does anyone know of a package in R that has a function to convert
network data (e.g. an adjacency matrix or ) from 2-mode to 1-mode? I am
conducting social network analysis. I know that Pajek has this function
under Net --> Transform --> 2-mode to 1-mode --> Rows. I have searched
the documentation under packages 'sna', 'network', 'igraph', and
2009 Feb 26
1
layout of igraph
Dear R users,
I am trying to draw a network using igraph package. I intend to place the
hub nodes (the ones with the relatively more connection with other nodes) in
the center of the graph. Also, the graph need to be in the fashion that the
higher the correlation between two nodes is , the closer the two nodes will
be. Is there any layout that can help or any other way to do this?
Thanks in
2009 Mar 03
1
save the layout using igraph
Hi R users,
I am using built-in functions in igraph package to draw networks . I need
to compare several network with exactly the same structure but with edge
hightlighted differently. I am wondering if there is a way to save the
layout so that every graph will look the same as each other except for the
colors of edges. Or is there any parameter I can set for this purpose??
Thanks in advance,
2009 Apr 06
2
Bonpower Crashes Trying Sparse Matrix (Igraph)
Hello All,
I have been trying to do bonpow for a while now.Bonpow works for few graphs
and for few others it goes out of memory.
I did see reply to one of the posting Alph Centrality Crashed in Igraph
memory error.
The solution in the posting was to use sparse matrix. This is the link of
the message.
http://lists.gnu.org/archive/html/igraph-help/2008-04/msg00071.html
I was able to obtain
2009 Apr 16
1
Igraph: family 'serif' not included in PostScript device
Does anybody know how to solve this error?
postscript(file= "file.ps", family = "Helvetica", font = "Helvetica")
plot.igraph(g, layout=layout.circle, vertex.label.font=2)
dev.off()
error in text.default(x, y, labels = labels, col = label.color, family
= label.family, :
family 'serif' not included in PostScript device
Regards Knut
2009 Mar 25
1
Weighted Graph Link strength ( I am making mistake please help)
Hello R experts,
I went through R mailing,Nabble R.I could not find solution.Can someone
help me.
I have undirected Graph.
Here is an example of spreadsheet I have( Unique 3559 Nodes)
snippet of 4 rows.
Node1 Node2 Weights
1 2 5
2 3 30
2 4 30
1 4 5
3 4 30
1 3 2
I created a program reading the csv and created a Adjacency matrix.From the
adjacency matrix I created graph.I am not sure the
2008 Nov 14
1
igraph and tkgraph
I have a number of (directed) graphs based on social groups, where the
members have expresed likes and dislikes in respect to the other
members. tkgraph makes it simple to draw the graphs in a very pleasing
way, but I would like to differentiate between positive and negative
relations in the graph by having the edges for the negative relations
dashed and the positive ones continuous.
Is
2011 Mar 03
2
Plotting Mean in plotting degree distribution
Hi,
I am plotting degree distribution of a graph using the function,
library(igraph)
dd1 = degree.distribution(G)
plot(dd1, xlab = "degree", ylab="frequency")
I would like to plot the mean of the distribution as a vertical line in the
attached plot.
Please let me know how to do this.
Thanks,
Kumar http://r.789695.n4.nabble.com/file/n3334375/cdata3_dd.png
cdata3_dd.png
--