[R] Package snow: is there any way to check if a cluster is "acticve"

[Søren Højsgaard]

Is there a 'proper' way of checking if cluster is active. For example, I create a cluster called .PBcluster

> str(.PBcluster)
List of 4
 $ :List of 3
  ..$ con :Classes 'sockconn', 'connection'  atomic [1:1] 3
  .. .. ..- attr(*, "conn_id")=<externalptr> 
  ..$ host: chr "localhost"
  ..$ rank: int 1
  ..- attr(*, "class")= chr "SOCKnode"
 $ :List of 3
....

Then I stop it with 
> stopCluster(.PBcluster)
> .PBcluster
[[1]]
$con
Error in summary.connection(x) : invalid connection

> str(.PBcluster)
List of 4
 $ :List of 3
  ..$ con :Classes 'sockconn', 'connection'  atomic [1:1] 3
  .. .. ..- attr(*, "conn_id")=<externalptr> 
  ..$ host: chr "localhost"
  ..$ rank: int 1
  ..- attr(*, "class")= chr "SOCKnode"

- but is there a way in which I can check if the cluster is active??

Regards
Søren