[R] data frames

[kjetil halvorsen]

Hola!

What about 

> fish2 <- fish[ !((Fish==1) | (Fish==4)) ,]

Kjetil Halvorsen.


aolinto at bignet.com.br wrote:
> 
> Dear R-list members
> 
> Here goes a question on data frames:
> 
> I want to create a new data frame excluding some records
> (rows) from an existing one.
> 
> Considering the data frame "fish.dat" at the end of this
> message, I can make a boxplot(Ring~Radius) and identify the
> points at rows 11 and 25 as outliers.
> 
> With the command fish.dat[c(11, 25),] I can identify which
> fishes are related to these rows (fishes #4 and #1).
> 
> With subset(fish.dat,reg==1) I can display all records from
> fish 1. My first question is:
> How can I list all records from fishes 1 and 4 at once?
> 
> Now I want to create a new data frame without the records from
> fishes 1 and 4.
> 
> The only way I know is to type
> newfish.dat <- fish.dat[-c(2,4,6,10,11,15, ... ),]
> 
> Probably there's an easier way that I couldn't find out. I've
> already made some trials, all with syntax problems.
> 
> Thanks,
> 
> Antonio Olinto
> Fisheries Institute
> Sao Paulo - Brasil
> 
>         Fish    Ring    Radius
> 1       2       1       0.36
> 2       4       1       0.37
> 3       3       1       0.44
> 4       1       1       0.45
> 5       5       1       0.47
> 6       4       2       0.58
> 7       2       2       0.59
> 8       3       2       0.68
> 9       5       2       0.72
> 10      1       2       0.80
> 11      4       3       0.63
> 12      2       3       0.85
> 13      3       3       0.93
> 14      5       3       0.97
> 15      1       3       1.05
> 16      4       4       0.95
> 17      3       4       1.11
> 18      2       4       1.15
> 19      5       4       1.15
> 20      1       4       1.28
> 21      4       5       1.13
> 22      3       5       1.29
> 23      5       5       1.32
> 24      2       5       1.35
> 25      1       5       1.49
> 
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