Removing objects from a list based on nrow

From: Linlin Yan <yanlinlin82 at gmail.com>
Subject: Re: [R] Removing objects from a list based on nrow
To: "Tim Clark" <mudiver1200 at yahoo.com>
Cc: r-help at r-project.org
Date: Saturday, November 28, 2009, 10:43 PM
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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reproducible code.