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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