[R] Select a group of data from a file

[Jeremy Baxter]

Try subset.

help(subset)

Subset returns a subsets of vectors, matrices or data frames which meet  
conditions. There are some excellent examples in the help. Here is an example 
similar to your email.

Create some data:

Var1<-sample(1:10,20,replace=TRUE)
Var2<-sample(1:10,20,replace=TRUE)

the.old.data<-cbind(Var1,Var2)

head(the.old.data)
     Var1 Var2
[1,]    8   10
[2,]    1   10


the.new.data <- subset(the.old.data, Var2==1)
the.new.data

HTH,
Jeremy

On Friday 18 January 2008 10:33:51 LA SPINA, MICHELANGELO wrote:
> I've a file with several data six variables, three quantitative and three
> qualitative, I would like to select a group of data from the file to
> analyze then, i.e: my file is like that (but with 6 variables):
>
> Var1   Var2
> 2       1
> 5       1
> 8       1
> 7       2
> 3       2
> 8       2
>
> I want to use only the data where var2 is "1"

-- 
Jeremy Baxter, Statistics Department, Rhodes University, South Africa.
Views expressed above, no matter how badly spelt, are my own... I think?