[R] Define column names to a series of data.frames

[Henrique Dallazuanna]

Yes, just in the list.
If they want change the name in Environment GlobalEnv:

 for(i in ls(pattern = "DF[0-9]"))
       assign(i, `names<-`(get(i), c("SDev","PC1", "PC2", "PC3",
"PC4", "PC5", "PC6")), globalenv())

On Thu, Mar 11, 2010 at 10:39 AM, Linlin Yan <yanlinlin82 at gmail.com> wrote:
> It seems that the names of original data frames have not changed in
> this way. I guess textConnection() could help, like this:
>
> for (name in objects(pattern = "df[0-9]"))
> eval(parse(textConnection(paste('names(', name, ') <-
> column_names'))))
>
> On Thu, Mar 11, 2010 at 9:25 PM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote:
>> You can try this:
>>
>> lapply(lapply(ls(pattern = 'DF[0-9]'), get),
>>       'names<-', c("SDev","PC1", "PC2", "PC3", "PC4", "PC5", "PC6"))
>>
>> On Thu, Mar 11, 2010 at 9:33 AM, Nikos Alexandris
>> <nikos.alexandris at felis.uni-freiburg.de> wrote:
>>> Greets to the list!
>>>
>>> I am aware that this topic has been discussed several times. And I've
>>> read quite some related posts [1]. Yet, can't seem to give a solution to
>>> my problem.
>>>
>>> I have 6 data frames consisting of 6 rows x 7 columns put together from
>>> other data.frames.
>>>
>>> Something like:
>>>
>>>   a b c d e f g
>>> v1 # # # # # # #
>>> v2 # # # # # # #
>>> v3 # # # # # # #
>>> v4 # # # # # # #
>>> v5 # # # # # # #
>>> v6 # # # # # # #
>>>
>>>
>>> I want to give the following column names to each data.frame: ("SDev",
>>> "PC1", "PC2", "PC3", "PC4", "PC5", "PC6")
>>>
>>> Works fine for one data.frame:
>>> column_names <- c("SDev", "PC1", "PC2", "PC3", "PC4", "PC5", "PC6")
>>> names( df1 ) <- column_names
>>>
>>> How is it to be done at once for all data.frames that the function
>>> objects(pattern = "SomePattern") can find?
>>>
>>> I've tried several things with assign, get, paste, for but I am not
>>> getting anywhere. I need to integrate this in a function that can handle
>>> lot's of data.frames and not only 6.
>>>
>>> Thank you, Nikos
>>>
>>>
>>> ---
>>> [1] I am stuck on this post:
>>> <http://www.mail-archive.com/r-help@stat.math.ethz.ch/msg32063.html>.
>>>
>>> It reads:
>>>
>>> dframes <- c("a","b","c")
>>> cols <- c("one","two")
>>> df <- data.frame(11:20, 21:30)
>>> names(df) <- cols
>>> assign(dframes[2], df)
>>>
>>> Can't understand the logic behind the "[2]".
>>>
>>> ______________________________________________
>>> 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.
>>>
>>
>>
>>
>> --
>> Henrique Dallazuanna
>> Curitiba-Paraná-Brasil
>> 25° 25' 40" S 49° 16' 22" O
>>
>> ______________________________________________
>> 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.
>>
>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O