Hi,
Not sure if the OP is concerned about this:
Using David's data
str(DATA)
#'data.frame': 15 obs. of 2 variables:
# $ UnitName_1: Factor w/ 3 levels "lake","pond",..: 3 3 1 3 2 2 3 1 2 3 ...
#$ Var : int 95 97 12 47 54 86 14 92 88 8 ...
toBeRemoved1 <- which(DATA$UnitName_1=="lake")
DATA <- DATA[-toBeRemoved1,]
str(DATA)
#'data.frame': 12 obs. of 2 variables:
# $ UnitName_1: Factor w/ 3 levels "lake","pond",..: 3 3 3 2 2 3 2 3 2 3 ...
# $ Var : int 95 97 47 54 86 14 88 8 99 35 ...
levels(DATA[,1])
#[1] "lake" "pond" "river" ############
DATA[,1]<- factor(DATA[,1])
str(DATA)
#'data.frame': 12 obs. of 2 variables:
# $ UnitName_1: Factor w/ 2 levels "pond","river": 2 2 2 1 1 2 1 2 1 2 ...
# $ Var : int 95 97 47 54 86 14 88 8 99 35 ...
levels(DATA[,1])
#[1] "pond" "river"
A.K.
----- Original Message -----
From: David Carlson <dcarl...@tamu.edu>
To: 'Shane Carey' <careys...@gmail.com>; r-help@r-project.org
Cc:
Sent: Thursday, June 13, 2013 10:00 AM
Subject: Re: [R] Remove levels
Works fine for me. Too bad you didn't include actual data:
> set.seed(42)
> DATA <- data.frame(UnitName_1=factor(sample(c("lake", "pond",
"river"),
+ 15, replace=TRUE)), Var=sample.int(100, 15))
> DATA
UnitName_1 Var
1 river 95
2 river 97
3 lake 12
4 river 47
5 pond 54
6 pond 86
7 river 14
8 lake 92
9 pond 88
10 river 8
11 pond 99
12 river 35
13 river 80
14 lake 39
15 pond 72
> toBeRemoved1 <- which(DATA$UnitName_1=="lake")
> toBeRemoved1
[1] 3 8 14
> DATA <- DATA[-toBeRemoved1,]
> DATA
UnitName_1 Var
1 river 95
2 river 97
4 river 47
5 pond 54
6 pond 86
7 river 14
9 pond 88
10 river 8
11 pond 99
12 river 35
13 river 80
15 pond 72
-------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77840-4352
-----Original Message-----
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Shane Carey
Sent: Thursday, June 13, 2013 7:03 AM
To: r-help@r-project.org
Subject: [R] Remove levels
I have a dataframe consisting of factors in one column. Im trying to
remove
certain levels using the following code:
toBeRemoved1<-which(DATA$UnitName_1=="lake")
DATA<-DATA[-toBeRemoved1,]
However it will not remove the level "lake"
In the past this worked for me, but its not working now. Any help
appreciated.
Thanks
--
Shane
[[alternative HTML version deleted]]
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
