In R, I have a weighted undirected graph as an igraph object :
IGRAPH e7a8fac UNW- 306 2829 --
+ attr: name (v/c), label (v/c), nom (v/c), sigle (v/c), statut (v/c), champ (v/c), cp (v/c), info (v/c), weight (e/n)
+ edges from e7a8fac (vertex names):
[1] 3 --9 7 --13 7 --15 13--15 11--16 15--17 6 --18 13--20 15--20 20--21 6 --25 18--25 6 --28 10--28 15--28 17--28 18--28 20--28 25--28
[20] 23--30 15--31 17--31 28--31 6 --33 17--33 18--33 22--33 25--33 28--33 7 --34 13--34 15--34 17--34 16--35 34--36 15--37 18--37 20--37
[39] 25--37 28--37 13--43 17--43 18--43 25--43 28--43 33--43 34--43 11--44 13--44 20--44 23--44 30--44 31--44 34--44 40--45 13--47 43--47
[58] 44--47 13--48 15--48 16--48 17--48 20--48 28--48 31--48 34--48 37--48 44--48 45--48 21--54 13--58 34--58 44--58 48--58 10--61 15--61
+ ... omitted several edges
I use another package (tnet) to calculate several indicators. At the end, I have a data frame with 4 columns :
id degree strength degree_alpha
[1,] 1 0 0.00000 0.000000
[2,] 2 2 3.00000 2.449490
[3,] 3 1 2.00000 1.414214
[4,] 4 1 2.00000 1.414214
[5,] 5 0 0.00000 0.000000
[6,] 6 25 19.10897 21.856906
I would like to add the three columns (degree
, strength
, degree_alpha
) as vertex attributes with matching ids (column id
in the data frame, attribute name
in igraph).
Igraph set_vertex_attr
seems to be the tool to use, but I can't figure out how to make it go through a data frame and only add attributes to existing nodes.