[R] converting a data-frame by a defined rule

[David Winsemius]

Another method :

 > DF[DF$row1 == "x", ]
   row1 row2 row3
1    x    2    3
2    x    1    4


On Dec 15, 2008, at 8:51 PM, Jorge Ivan Velez wrote:

> Dear Jörg,
> Try this:
>
> # Data
> DF=read.table(textConnection("
> row1    row2    row3
> x               2               3
> x               1               4
> y               5               3
> y               2               3"),header=TRUE)
> closeAllConnections()
>
> # Splitting
> res=with(DF,split(DF,row1))
> res
>
>
> # To access the first data.frame just type
> res$x
>
> See ?split for more details.
>
>
> HTH,
>
> Jorge
>
>
>
> On Mon, Dec 15, 2008 at 8:43 PM, Jörg Groß <joerg at licht-malerei.de>  
> wrote:
>
>> Hi,
>>
>> I have a data frame with several columns.
>>
>> Now I want to transfer the data into a new variable (also a data  
>> frame),
>> but I only want a part of the data, defined by a rule ...
>>
>>
>> for example; I have following data frame:
>>
>> row1    row2    row3
>> x               2               3
>> x               1               4
>> y               5               3
>> y               2               3
>>
>> I know want a data frame, only with lines containing x in row1.
>>
>> I know how to do that for one row    (f <- d$row2[d$row1=="x"]).
>> But how can I do that for all rows in one step?
>>
>>
>> So that I get this for f:
>>
>> row1    row2    row3
>> x               2               3
>> x               1               4
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.