Re: [igraph] igraph slow when plotting

[Gábor Csárdi]

Hi Simone,

> library(igraph)

> g<-graph.empty(n=0, directed=T)

> # add nodes

> g<-add.vertices(g, length(df[,1]), attr=df)

Error in add.vertices(g, length(df[, 1]), attr = df) : 

  please supply names for attributes

please send reproducible code, and information about your platform.

Vertices are indeed plotted one by one if they have different shapes.

Gabor

On Fri, Feb 28, 2014 at 6:29 AM, Simone Gabbriellini <address@hidden> wrote:

Dear List,

I have observed a strange behavior in igraph with R. If I do:

g<-graph.empty(n=0, directed=T)
# add nodes
g<-add.vertices(g, length(df[,1]), attr=df)
# plot
plot(g, vertex.size=3, vertex.label.cex=0.7, vertex.label.dist=0.3)

it’s fast as usual, but if I do:

g<-graph.empty(n=0, directed=T)
# add nodes
g<-add.vertices(g, length(df[,1]), attr=df)
# shape visualization, if type = city -> squared, else circle
V(g)[type=="city"]$shape<-"square"
V(g)[type=="potter"]$shape<-"circle"
# plot
plot(g, vertex.size=3, vertex.label.cex=0.7, vertex.label.dist=0.3)

then it looks like it plots vertices one by one… and it takes considerably more time… any guess where I am wrong?

best,
Simone
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