Re: [igraph] ordering the vertex sequence

[Gábor Csárdi]

nei is a function that is used in V() subsetting, you need to call your data frame something else than nei.

Gabor

On Fri, May 9, 2014 at 12:02 PM, Luca Rossi <address@hidden> wrote:

HI,

I’m sorry. I’m trying to write here my code:

MLau <- graph.data.frame(aucs.mlnet.v9,directed=FALSE)

> MLau

IGRAPH UN-- 61 1240 -- 

+ attr: name (v/c), Label (e/c)

> V(MLau)

Vertex sequence:

 [1] "U102" "U106" "U107" "U109" "U10"  "U110" "U112" "U113" "U118" "U123" "U124" "U126" "U130" "U134" "U138" "U139"

[17] "U13"  "U140" "U141" “U142” …

nei  <- data.frame(user=MLcoauthor$V1,coauthor=MLcoauthor$V3,facebook=MLfacebook$V3,leisure=MLleisure$V3,lunch=MLlunch$V3,work=MLwork$V3,stringsAsFactors=FALSE)

> head(nei)

  user coauthor facebook leisure lunch work

1 U102        0        0       0     2    0

2 U139        0        0       0     1   11

3  U33        0        0       0     6    9

4 U106        1        7       2     7    4

V(MLau)[nei$user]$nefacebook  <- nei$facebook

Error in nei$user : object of type 'closure' is not subsettable

 

thanks for helping!

Luca

On 09 May 2014, at 17:10, Gábor Csárdi <address@hidden> wrote:

You are doing something wrong. (It would be much easier to tell what, if you showed me what you are doing, btw.)

G.

library(igraph)

df <- data.frame(id=sample(letters[1:5]), attr=1:5,

                 stringsAsFactors=FALSE)

df

#   id attr

# 1  b    1

# 2  c    2

# 3  a    3

# 4  e    4

# 5  d    5

g <- graph.ring(5)

V(g)$name <- letters[1:5]

V(g)[df$id]$attr <- df$attr

get.data.frame(g, what="vertices")

#   name attr

# a    a    3

# b    b    1

# c    c    2

# d    d    5

# e    e    4

On Fri, May 9, 2014 at 10:59 AM, Luca Rossi <address@hidden> wrote:

Hi Gabor,

thanks a lot. 

It gives me an error “ object of type 'closure' is not subsettable” that I don’t really understand.

any idea?

thanks!

Luca Rossi

On 09 May 2014, at 16:44, Gábor Csárdi <address@hidden> wrote:

V(network)[dataframe$name]$attribute <- dataframe$attribute

Untested, so please check the result.

G.

On Fri, May 9, 2014 at 10:34 AM, Luca Rossi <address@hidden> wrote:

Hi,

I’m facing a problem that I guess should be quite simple but I can’t find a good way to solve it.
I need to add to an igraph network vertex attributes that I have on a dataframe.

basically what I need to do is to add to V(network)[name==“X”] an $attribute value taken from a data frame when name is equal to dataframe$name.
The easiest way to do that I guess it would be to sort the vertex sequence according to the name, is that possible?

thanks a lot

Luca


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