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Drop unused factor levels in a subsetted data frame
user_2002705
0
•
asked Jul 28, 2009
591
16
438703
r-factor
r-faq
dataframe
r
The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or dataframe
user_135870
0
•
asked Jul 23, 2009
639
11
300232
r-faq
dataframe
extract
r
list
Test if a vector contains a given element
user_2002705
0
•
asked Jul 23, 2009
609
8
882574
r-faq
vector
r
How can I remove an element from a list?
David_Locke_1447
0
•
asked Mar 16, 2009
344
18
597363
r-faq
r
indexing
list
How to search for "R" materials?
Admin
1
•
asked Sep 19, 2008
133
21
15796
r-faq
r
search
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