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rsubset

How can I subset a list in r by extracting the elements that contain a string?

I have a list:

mylist<-list()
data<-1:162
listlabel<-c("a","bpt","b","fpt")
for (i in 1:4){
label<-listlabel[i]
mylist[[label]]<-data
}

I want to create a new list from the elements in my list that contain a certain string: in this case 'pt'. My new list should contain the elements 'bpt' and 'fpt'.

I thought 'grep' would do it, but when I try it, it returns an empty list.

newlist<-list(grep("pt",mylist))

How can I create the new list keeping only the selected elements containing my string?

Solution

  • The grep should be on the names and not the values of the list

    mylist_sub <- mylist[grep('pt', names(mylist))]