[R] data.frame package?

[Anders Nielsen]

Dear Eryk

All of these operations are possible in R, as the following 
example show 

Kind regards, 

Anders.  

> data1<-data.frame(x=1:5, y=1:5/10)
> data2<-data.frame(x=6:10, y=6:10/10)
> data12<-rbind(data1,data2)
> data12
    x   y
1   1 0.1
2   2 0.2
3   3 0.3
4   4 0.4
5   5 0.5
6   6 0.6
7   7 0.7
8   8 0.8
9   9 0.9
10 10 1.0
> is.data.frame(data12)
[1] TRUE
> data12x<-subset(data12, select=-y)
> data12x
    x
1   1
2   2
3   3
4   4
5   5
6   6
7   7
8   8
9   9
10 10
> data12BigX<-subset(data12, x>5)
> data12BigX
    x   y
6   6 0.6
7   7 0.7
8   8 0.8
9   9 0.9
10 10 1.0
> data12BigX
> as.matrix(data12)
    x   y
1   1 0.1
2   2 0.2
3   3 0.3
4   4 0.4
5   5 0.5
6   6 0.6
7   7 0.7
8   8 0.8
9   9 0.9
10 10 1.0

On Tue, 2002-04-30 at 16:58, Witold Eryk Wolski wrote:
> Is there a library that is able for example to
> 1. merge 2 dataframes by row  eg.: rbind(dataframe1, dataframe2):data.frame
> 2. delete a column from a dataframe del(dataframe, colname) or 
> del(dataframe, colindex= 1):data.frame?
> 3. Select lines from a dataframe by a specific function ? 
> select(dataframe, func=small(x){x<1}, colindex=3): data.frame?
> 4. converting all double columns of a data.frame to a matrix. 
> datafram_to_matrix(dataframe1):matrix
> 
> If not would not it be usefull to have such a library on the cran?
> 
> Sincerely
> Eryk
> 
> 
> -- 
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