I am attempting to subcluster groups within a certain analysis (FlowSOM). I would like to remove 30 subgroups to 1 new analysis but I seem to be doing something wrong.

I first tried to just use 1 cluster

newsubset<-FlowSOMSubset(fsom, GetMetaclusters(fsom, meta=fsom$metacluster == 6))

This indeed subsetted only cluster 6

As i need a string of different clusters I tried to select (2) different subclusters and use these:
newsubset<-FlowSOMSubset(fsom, GetMetaclusters(fsom, meta=fsom$metacluster == c('6','9')))

This indeed subsetted cluster 6 and 9

However, adding more numbers e.g.

newsubset <-FlowSOMSubset(fsom, GetMetaclusters(fsom, meta=fsom$metacluster == c('6','9','10')))
subsetted only cluster 6?

Now I am at a loss on how to make the string to add more clusters.