You can of course make your own function to do this all "in one step"
split2env <- function(x, f, drop = FALSE, ...){
list2env(split(x, f, drop), ...)
}
But why do you need this for other tasks as a one-liner?
M
On Wed, Feb 8, 2012 at 6:29 PM, Johannes Radinger <jradin...@gmx.at> wrote:
>
> Am 08.02.2012 um 23:47 schrieb David Winsemius:
>
>>
>> On Feb 8, 2012, at 5:06 PM, Johannes Radinger wrote:
>>
>>>
>>> Am 08.02.2012 um 22:19 schrieb David Winsemius:
>>>
>>>>
>>>> On Feb 8, 2012, at 4:11 PM, Johannes Radinger wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I want to split a dataframe based on a grouping variable (in one column).
>>>>> The resulting new
>>>>> dataframes should be stored in a new variable. I tried to split the
>>>>> dataframe using split() and
>>>>> to store it using a FOR loop, but thats not working so far:
>>>>>
>>>>> df <- data.frame(A=c("A1","A1","A2","A2"),B=seq(1:4))
>>>>>
>>>>> Fsplit <- function(x,y){
>>>>> ls <- split(x,f=x$y)
>>>>> for (i in names(ls)){
>>>>> i <- ls$i
>>>>> }
>>>>> }
>>>>>
>>>>> Fsplit(df,A) #1st argument is dataframe to split, 2nd argument grouping
>>>>> variable
>>>>>
>>>>
>>>> It appears you want the name of the levels of df$A to be the names of
>>>> separate variables in the global environment. If that is correct, then see
>>>> the FAQ. I'm not sure which one it is among the Miscellaneous section, but
>>>> you should be looking of the one that tells you how to construct a named
>>>> variable.
>>>>
>>>
>>> Your hint with the global environment brought me on track. It seems that I
>>> this task can be done with list2env() although there is still a problem
>>> with my function. How
>>> can I parse the name of the dataframe and the column name in the function...
>>>
>>> df <- data.frame(A=c("A1","A1","A2","A2"),B=seq(1:4))
>>>
>>> Fsplit <- function(x,y){
>>> ls <- split(x,f=x$y)
>>> list2env(ls,envir = .GlobalEnv)
>>> }
>>>
>>> Fsplit(df,A)
>>
>> I still have not figured out what you really want to do. The simple answer
>> to what you ask for in your written request is simply:
>>
>> dfvar <- split(df, df$A)
>>
>> So what is it about that result that is not useful for your (as yet
>> unstated) destination?
>>
>> > split(df, df$A)
>> $A1
>> A B
>> 1 A1 1
>> 2 A1 2
>>
>> $A2
>> A B
>> 3 A2 3
>> 4 A2 4
>>
>>
>
> Sorry for not being clear enough, and your are
> right as "split(df, df$A)" is what I want. Additionally I want to store
> afterwards
> the single objects of the list in new dataframes
> where variable name = name of list object (which can be done with list2env()).
> Is that clear enough so far?
>
> What I want exactly is to express that two operations (split, list2env) within
> one function. I need the function for other tasks in R.
>
> /johannes
>
>>
>>
>>
>>>
>>> /johannes
>>>
>>>> Or:
>>>>
>>>> ? assign
>>>>
>>>> --
>>>> David Winsemius, MD
>>>> West Hartford, CT
>>>>
>>>
>>
>> David Winsemius, MD
>> West Hartford, CT
>>
>
>
> [[alternative HTML version deleted]]
>
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