[R] Import multiple data frames and combine them using "cbind"

[David Winsemius]

On Dec 4, 2012, at 8:56 PM, Gyanendra Pokharel wrote:

> Thanks Dennis,
> Your code also produces same as Jim's but I am not looking that one,  
> I need
> to use "cbind" so that finally I will get the data frame of size  
> 200X320
> (i,e, 200 X(16X20)).
> Thanks

Here we are a day later and your question risks sinking beneath the  
waves because you have not realized that you are implicitly making  
impossible demands on your volunteer consultants. Please review your  
postings and responses and try to put yourself in the position of  
someone who doesn't have the capacity to read your mind or see your  
screen.

-- 
David.
>
>
> On Tue, Dec 4, 2012 at 10:46 PM, Dennis Murphy <djmuser at gmail.com>  
> wrote:
>
>> In addition to Jim's reply, had you used the plyr package, you could
>> have done this in one shot:
>>
>> library(plyr)
>>
>> DF <- ldply(llply(temp, read.table), rbind)
>>
>> The inner llply call is equivalent to your lapply() and the outer
>> ldply() is equivalent to Jim's do.call() code.
>>
>> Dennis
>>
>> On Tue, Dec 4, 2012 at 6:37 PM, Gyanendra Pokharel
>> <gyanendra.pokharel at gmail.com> wrote:
>>> Hi group,
>>>
>>> I imported  16 data frames using the function "list.files"
>>>
>>> temp <- list.files(path="...........")
>>> myfiles = lapply(temp, read.table,sep = "")
>>>
>>> Now I have 16 data set imported in R window.
>>>
>>> I want to combine them by row and tried some thing like (Here I am
>>> considering only 20 columns)
>>>
>>> for(i in 1:16){
>>>    data<- cbind(myfiles[[i]][,1:20])
>>>
>>> }
>>>
>>>
>>> but it returns only first data set. I can combine them using
>>>
>>> data <- cbind(myfiles[[1]][,1:20],myfiles[[2]] 
>>> [1:20],...............)
>>>
>>> But  I want in a loop so that I can make the efficient code.
>>>
>>> Any kind of suggestion will be great for me.
>>>
>>> Thanks
>>>
>>>        [[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.
>>
>
> 	[[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.

David Winsemius, MD
Alameda, CA, USA