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## [igraph] representation large networks with edge and nodes features

**From**: |
Leonardo Mazzoni |

**Subject**: |
[igraph] representation large networks with edge and nodes features |

**Date**: |
Fri, 01 Jun 2018 11:40:56 +0200 |

**User-agent**: |
webmail UniFI |

Hi everybody,
I need to represent a large matrix with the following features.

`It is a symmetric 562x562 matrix composed by decimal values that goes
``from 0 to 1 and I would like to represent its maximum spanning tree
``(with the function mst, weighting for the negative values) with the
``following features:
`

`1) assign quantitative attributes to nodes, shaping their size (setting
``a scale) and creating the correspondent legend
``2) assign qualitative attributes to nodes, defining their colour
``(setting correspondent category) and creating the correspondent legend
`
Then, the representation of my networks should be like these:

`a) represent first a graph with the chacateristics of point 1 and 2 with
``the edge values (that go from 0 to 1) with only the values bigger than a
``certain threshold of relationship (e.g. bigger than 0.3);
``b) represent a second graph with the chacateristics of point 1 and 2
``with all the edge values, assigning diverse colours to diverse level of
``intensity of the relationship (from 0.1 to 0.2, from 0.2 to 0.3,etc..).
`

`I tried to do something, but I stopped, looking at the incomprehensible
``graph that I produced..
`I forward my first attempt to do it with i-graph:

`g <- graph_from_adjacency_matrix(foo, mode = "upper", weighted = T, diag
``= F)
`max_spann_tree <- mst(g, weights = -E(g)$weight)

`plot.igraph(max_spann_tree,vertex.label=V(net)$name,
``vertex.attibutes=V(net),
``edge.color="grey",vertex.color="red",edge.attributes=E(g)$weight,layout=layout.spring)
`
Any suggestions to do it in igraph?

`In the attachment there is a picture of the Product Space by Hidalgo et
``al. (2007), that is more or less the picture I would like to get.
`https://www.google.com/search?q=the+product+space+hidalgo&client=firefox-b-ab&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjOiNu5lbLbAhWIcRQKHV5VCSIQ_AUICigB&biw=1366&bih=654#imgrc=FeSyfj9wjHcVnM:
Many thanks in advance!
Regards

**
**`TheProductSpace.png`

*Description:* PNG image

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