[R] remove component from list or data frame

[Jason Horn]

Sorry to ask such a simple question, but I can't find the answer after 
extensive searching the docs and the web.

How do you remove a component from a list?  For example say you have:

lst<-c(5,6,7,8,9)

How do you remove, for example, the third component in the list?

lst[[3]]]<-NULL     generates an error:  "Error: more elements supplied 
than there are to replace"



Also, how do you remove a row from a data frame?  For example, say you 
have:

lst1<-c(1,2,3,4,5)
lst2<-c(6,7,8,9,10)
frame<-data.frame(lst1,lst2)

How do you remove, for example, the second row of frame?

Thanks,

- Jason