converting a data-frame by a defined rule

Dear J?rg,
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, J?rg Gro? <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

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