Removing objects from a list based on nrow
Try these: sapply(lst, nrow) # get row numbers which(sapply(lst, nrow) < 3) # get the index of rows which has less than 3 rows lst <- lst[-which(sapply(lst, nrow) < 3)] # remove the rows from the list
On Sun, Nov 29, 2009 at 4:36 PM, Tim Clark <mudiver1200 at yahoo.com> wrote:
Dear List,
I have a list containing data frames of various numbers of rows. ?I need to remove any data frame that has less than 3 rows. ?For example:
df1<-data.frame(letter=c("A","B","C","D","E"),number=c(1,2,3,4,5))
df2<-data.frame(letter=c("A","B"),number=c(1,2))
df3<-data.frame(letter=c("A","B","C","D","E"),number=c(1,2,3,4,5))
df4<-data.frame(letter=c("A","B","C","D","E"),number=c(1,2,3,4,5))
lst<-list(df1,df2,df3,df4)
How can I determine that the second object (df2) has less than 3 rows and remove it from the list?
Thanks!
Tim
Tim Clark
Department of Zoology
University of Hawaii
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