subset data right
You did not change df$quant - you made a new object called 'subdf' containing a column called 'quant' that had only one level. Changing subdf has no effect on df.
df <- data.frame(quant=factor(letters)) str(df)
'data.frame': 26 obs. of 1 variable: $ quant: Factor w/ 26 levels "a","b","c","d",..: 1 2 3 4 5 6 7 8 9 10 ...
subdf <- subset(df, quant %in% "a") subdf$quant <- factor(subdf$quant) str(df)
'data.frame': 26 obs. of 1 variable: $ quant: Factor w/ 26 levels "a","b","c","d",..: 1 2 3 4 5 6 7 8 9 10 ...
str(subdf)
'data.frame': 1 obs. of 1 variable: $ quant: Factor w/ 1 level "a": 1 Bill Dunlap TIBCO Software wdunlap tibco.com On Thu, May 26, 2016 at 12:35 PM, ch.elahe via R-help <r-help at r-project.org> wrote:
Hi all,
I have the following df and I want to know which Protocols are VeryFast,
which are FAST, which are SLOW and also which ones are VerySLOW :
$ Protocol : Factor w/ 48 levels "DP FS QTSE SAG",..: 5 5 28 5 5 5
7 7 47 5 ...
$ quant : Factor w/ 4 levels "FAST","SLOW",..: 2 2 2 4 2 1 1 2 4
I do the following subset but nothing is changed in my df:
subdf=subset(df,quant%in%c("VeryFast"))
subdf$quant=factor(subdf$quant)
and when I get the str(df) again Protocol has 48 levels. Does anyone know
how can I get these subsets right?
Thanks for any help!
Elahe
______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.