r - Maintain attribute names when merging Igraphs -


problem

i have 2 separate networks no overlapping nodes or edges, both have same attributes. want combine these 2 networks single network made of 2 distinct components.

however when try merge them using union command attributes renamed "attribute" "attribute_1" , "attribute_2". happen stated in command file, cannot find obvious way merge these 2 networks.

the situation shown in below code block

library(igraph)  #create 4 node network of 2 components adjmat <- rep(0, 16) adjmat[c(2,5,12,15)] <- 1 g <-  graph.adjacency(matrix(adjmat, nrow = 4) , mode = "undirected")   #give attributes naming nodes , edges g <- set_vertex_attr(g, "name", value = paste0("node_", 1:4)) g <- set_edge_attr(g, "name", value = paste0("edge_",1:2))  #i interested in type attribute g <- set_edge_attr(g, "type", value = c("foo", "bar"))  plot(g)  #decompose seperate networks glist <- decompose(g)  g2 <-union(glist[[1]], glist[[2]])  #vertices fine edges have been renamed stated in helpfile union. get.edge.attribute(g2) get.vertex.attribute(g2)

work around

currently 2 separate networks originate same original network have been able make hack isn't case , more igraph way of merging two.

the hack below

#to solve problem following  #create 2 dataframes edge characteristics of network , combine single dataframe p <- rbind(as_data_frame(glist[[1]]),                as_data_frame(glist[[2]]))  g3 <- set.edge.attribute(g, "type", value = p$type[match(p$name,  get.edge.attribute(g, "name"))])   #edges correct get.edge.attribute(g3)matrix(adjmat, nrow = 4)  get.vertex.attribute(g3)

is there function in igraph merge 2 seperate networks single network whilst maintaining attributes is?

i have made below version of union, accepts 2 graphs arbitrary number of overlapping attributes , merges them single graph attributes not have "_x" suffix. graphs can entirely independent or have overlapping nodes. in case of overlapping nodes attributes of graph 1 take precedence

library(dplyr)  union2<-function(g1, g2){   #creates union of 2 networks, , merges attributes same name.   #in case there overlapping nodes attributes of g1 take precedence   #g1 & g2: igraph networks should merged.    g <- union(g1, g2)  #looks see attributes need cleaning cleanedgeattr <- get.edge.attribute(g) %>% names() %>% grepl("(_\\d)$", . )  edgenames  <- get.edge.attribute(g) %>% names() %>% gsub("(_\\d)$", "", .)  #looks see attributes need cleaning cleanvertexattr <- get.vertex.attribute(g) %>% names() %>% grepl("(_\\d)$", . )  vertexnames  <- get.vertex.attribute(g) %>% names() %>% gsub("(_\\d)$", "", .)   #clean edges for( in unique(edgenames[cleanedgeattr])){    attr1 <- get.edge.attribute(g, paste0(i, "_1"))    attr2 <- get.edge.attribute(g, paste0(i, "_2"))    g <- set.edge.attribute(g, i, value = ifelse(is.na(attr1), attr2, attr1))    g <- remove.edge.attribute(g, paste0(i, "_1"))   g <- remove.edge.attribute(g, paste0(i, "_2"))  }  #clean vertices for( in unique(vertexnames[cleanvertexattr])){    attr1 <- get.vertex.attribute(g, paste0(i, "_1"))    attr2 <- get.vertex.attribute(g, paste0(i, "_2"))    g <- set.vertex.attribute(g, i, value = ifelse(is.na(attr1), attr2, attr1))    g <- remove.vertex.attribute(g, paste0(i, "_1"))   g <- remove.vertex.attribute(g, paste0(i, "_2"))  }  return(g)  }

using previous example

g4 <-union2(glist[[1]], glist[[2]])  #as get.edge.attribute(g4) get.vertex.attribute(g4)

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