I realize that matrix indexing has been addressed in various flavors, but I'm stumped and didn't find anything in the archives. It's not clear if it is an igraph issue or a more general problem. Thanks in advance for your patience.
I am using igraph to read a gml file (http://www-personal.umich.edu/~mejn/netdata/football.zip ). The gml file contains vertex attributes (conference and team) that are provided as character/integer values. I would like to build a matrix of dimension (length.team, length.conference) where the elements are zero except for 1's at the location of index [team, conference]. Here is a snippet of code that hopefully captures what I am trying to do: original<-read.graph("./Data/football/football.gml", format="gml") conf.list<- get.vertex.attribute(original, 'value', index=V(original))+1 team.list<- get.vertex.attribute(original, 'id', index=V(original))+1 temp<- matrix(0,115,12) temp[team.list, conf.list]<-1 Unfortunately, temp[] is filled with 1's. However, if I try: c.list=c(1,3,5) t.list=c(2,4,6) temp[t.list,c.list]<-1 then things work as I would expect. FWIW - I have tried as.integer(get.vertex.attribute(...)) with no luck. Thanks for any suggestions. ***************************************************** > original<-read.graph("./Data/football/football.gml", format="gml") > conf.list<- get.vertex.attribute(original, 'value', index=V(original))+1 > team.list<- get.vertex.attribute(original, 'id', index=V(original))+1 > conf.list [1] 8 1 3 4 8 4 3 9 9 8 4 11 7 3 7 3 8 10 7 2 10 9 9 8 11 1 7 10 12 2 2 7 3 1 7 2 6 [38] 1 7 3 4 8 6 7 5 1 12 3 5 12 11 9 4 12 7 2 10 5 12 11 3 7 10 11 3 10 5 12 9 11 10 7 4 12 [75] 4 5 10 9 9 2 6 4 6 12 4 7 5 10 12 1 6 5 5 8 2 10 10 11 4 7 3 2 4 1 8 1 3 4 9 1 5 [112] 9 5 10 12 > team.list [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 [28] 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 [55] 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 [82] 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 [109] 109 110 111 112 113 114 115 > length(conf.list) [1] 115 > length(team.list) [1] 115 > temp<- matrix(0,115,12) > r<-c(1,3,5) > col<- c(2,4,6) > temp[r,col]<-1 > temp[1:10,] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [1,] 0 1 0 1 0 1 0 0 0 0 0 0 [2,] 0 0 0 0 0 0 0 0 0 0 0 0 [3,] 0 1 0 1 0 1 0 0 0 0 0 0 [4,] 0 0 0 0 0 0 0 0 0 0 0 0 [5,] 0 1 0 1 0 1 0 0 0 0 0 0 [6,] 0 0 0 0 0 0 0 0 0 0 0 0 [7,] 0 0 0 0 0 0 0 0 0 0 0 0 [8,] 0 0 0 0 0 0 0 0 0 0 0 0 [9,] 0 0 0 0 0 0 0 0 0 0 0 0 [10,] 0 0 0 0 0 0 0 0 0 0 0 0 > temp[team.list,conf.list]<- 1 > temp[1:10,] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [1,] 1 1 1 1 1 1 1 1 1 1 1 1 [2,] 1 1 1 1 1 1 1 1 1 1 1 1 [3,] 1 1 1 1 1 1 1 1 1 1 1 1 [4,] 1 1 1 1 1 1 1 1 1 1 1 1 [5,] 1 1 1 1 1 1 1 1 1 1 1 1 [6,] 1 1 1 1 1 1 1 1 1 1 1 1 [7,] 1 1 1 1 1 1 1 1 1 1 1 1 [8,] 1 1 1 1 1 1 1 1 1 1 1 1 [9,] 1 1 1 1 1 1 1 1 1 1 1 1 [10,] 1 1 1 1 1 1 1 1 1 1 1 1 > > --------------------------------------------- [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
