[R] subset data right

[ruipbarradas at sapo.pt]

Hello,

Don't use subset, use indexing.

subdf <- df[df$quant %in% "VeryFast", ]

By the way, instead of %in% you can use ==, since you're interested in  
just one value of quant.

Hope this helps,

Rui Barradas

Citando ch.elahe via R-help <r-help at r-project.org>:

> 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
>
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