Displaying 3 results from an estimated 3 matches for "vertex1".
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2011 May 05
1
Looping over graphs in igraph
...ity detection algorithms on a couple thousand
small graphs but don't know how to automate igraph looking at multiple
graphs described in a single csv file. My data look like something in ncol
format, but with an additional column that has an ID for which graph the
edge belongs in:
Graph ID | Vertex1 | Vertex2 | weight
1 | Alice | Bob | 2
1 | Alice | Chris | 1
1 | Alice | Jane | 2
1 | Bob | Jane | 2
1 | Chris | Jane | 3
2 | Alice | Tom | 2
2 | Alice | Kate | 1
2 | Kate | Tom | 3
2 | Tom | Mike | 2
so on and so forth for about 2000 graph IDs, each with about 20-40
vertices. I've...
2011 Aug 05
1
matrix into vector with vertex names
Using Igraph, I create shortest paths, then convert the matrix into
three column vectors - "vertex1", "vertex2", "shortestpath" - as the
code below shows.
#code for generating shortest path matrix and creating a 3 columns
from an igraph graph object "y"
y_s<-shortest.paths(y, weights = NULL)
y_s <- melt(y_s)[melt(upper.tri(y_s))$value,] #Step 2: this is...
2011 Apr 09
3
Converting edgelist to symmetric matrix
Hi,
I have network data in the form of a couple of edgelists containing weights in
the format "x,y,weight" whereby x represents row header and y represents column
header. All edgelists are based on links among 634 nodes and I need to convert
them into a 634*634 weighted matrix.
I searched for online help using possible keywords I know, but I could not find
a clue how to do this in