Stack Overflow
Stack Overflow

Questions tagged [network-analysis]

Primarily, analysis of general networks using graph theory. In particular, social network analysis. Less commonly, refers to packet sniffing with tools like Wireshark.

392 questions
23
votes
2 answers

Cannot create a directed graph using from_pandas_dataframe from networkx

I'm learning networkx library and use twitter retweet directed graph data. I first read the datasets into pandas df (columns are 'from','to','weight') and wanted to put a first 300 rows(retweet) into a graph using below code: tw_small =…
user3368526
  • 2,168
  • 10
  • 37
  • 52
16
votes
3 answers

WireShark doesn't decode gzip'ed http traffic on Windows

Do you guys know why WireShark may refuse to decode gzip'ed http traffic on Windows? My configuration WireShark 1.8.3 Windows 7 Ultimate x64 WinPcap 4.1.2 Option "Uncompressed entity bodies" is checked in Preferences / Protocols / HTTP. Here is…
expert
  • 29,290
  • 30
  • 110
  • 214
15
votes
4 answers

How to efficiently calculate triad census in undirected graph in python

I am calculating triad census as follows for my undirected network. import networkx as nx G = nx.Graph() G.add_edges_from( [('A', 'B'), ('A', 'C'), ('D', 'B'), ('E', 'C'), ('E', 'F'), ('B', 'H'), ('B', 'G'), ('B', 'F'), ('C', 'G')]) from…
EmJ
  • 4,398
  • 9
  • 44
  • 105
12
votes
1 answer

Gephi not showing Nodes & Edges on graph

It's been awhile since I've used Gephi, but I used to be pretty familiar with everything in v 0.8.xx. I just loaded node & edge files into a brand-new installation of v0.9.0. They show up fine in the data lab & the context menu shows they exist.…
CCapra
  • 139
  • 1
  • 1
  • 4
9
votes
1 answer

Using geo-coordinates as vertex coordinates in the igraph r-package

In the igraph package for R, I am struggling to plot a social network using latitude/longitude coordinates as the layout of the graph. Imagine this simple example: a network with 4 nodes of which you know the geographical location and the…
willemr
  • 93
  • 1
  • 4
9
votes
2 answers

Changing node/vertice opacity in iGraph in R

I have a network that, when I plot it, has a number of overlapping nodes. I want to change the opacity of the colors so that you can see nodes underneath others when they overlap. As an example, see this video: https://vimeo.com/52390053 I'm using…
Net20
  • 105
  • 1
  • 5
8
votes
1 answer

igraph - Neighbors as subgraph - make_ego_graph() as single graph

I'd like to construct a subgraph of a graph of a directed network with all the vertices sharing a certain vertex attribute (say, V(Grph)$year == "1952") and their first-order (immediate) neighbors, based only on the out-degree. I've tried ego(),…
user5835099
  • 127
  • 1
  • 8
7
votes
1 answer

Modifying a multilayer network plot in pymnet

I want to visualise a multilayer network using pymnet. The example in the package's documentation shows how to plot a multilayer network (left-hand side of the plot below) but I would like to add another layer (orange) that would be displayed at a…
epo3
  • 2,991
  • 2
  • 33
  • 60
7
votes
1 answer

Show only specific labels on network graph using igraph in R

I'm trying to plot a graph that only displays the labels for certain vertices. In this case, I want to only display labels for vertices with a certain number of edges. I'm reading vertices and edges into the graph object like so: nodes <-…
tchaymore
  • 3,728
  • 13
  • 55
  • 86
7
votes
1 answer

Making igraph clearer to read

I have a directed igraph with 69 vertices, shown below. It was plotted using the igraph package: library(igraph) ig <- graph.adjacency(data, mode="directed", weighted=TRUE) plot(ig) I'm looking to achieve the following 2 things: (a) Space the…
user2846211
  • 949
  • 6
  • 16
  • 24
6
votes
1 answer

Using R package sfnetworks to subset river network that is upstream of a given node

I'm experimenting with using the sfnetworks package to query river networks. Specifically, I'd like to subset upstream portions of a river network relative to any given site. I have a small river network dataset (available here) that I can convert…
mbcaradima
  • 251
  • 2
  • 11
5
votes
1 answer

What can cause different results in communities detected after scaling edge weights of a graph with python-louvain?

I noticed that if I change all the edge weights in the graph with the same value, community.best_partition doesn't always result in the same communities. I used the same random state in all cases and the graph is exactly the same just that instead…
Magda Anastasiadou
  • 71
  • 4
5
votes
3 answers

How to create an edge list from pandas dataframe?

I have a pandas dataframe (df) of the form- Col1 A [Green,Red,Purple] B [Red, Yellow, Blue] C [Brown, Green, Yellow, Blue] I need to convert this to an edge list i.e. a dataframe of the form: Source Target Weight A B …
Melsauce
  • 2,535
  • 2
  • 19
  • 39
5
votes
1 answer

Sorting nodes according to degree and manipulating in R using igraph

the datasets I am working with shows links between nodes.For Example: > data2 V1 V2 1 10000 4725 2 4725 6805 3 4725 3250 4 5725 3250 5 1725 7673 (Using a small dataframe for example).Here the dataframe says that there is an undirected link…
Kitne
  • 53
  • 1
  • 4
5
votes
3 answers

build word co-occurence edge list in R

I have a chunk of sentences and I want to build the undirected edge list of word co-occurrence and see the frequency of every edge. I took a look at the tm package but didn't find similar functions. Is there some package/script I can use? Thanks a…
leoce
  • 715
  • 1
  • 8
  • 24
1
2 3
…
26 27