R help - Oct 2009 - how do I name data frames and files according to the index of a for loop?

Thanks in advance for reading my question.
This is my first time working with R, though I have some intro-level 
experience with other languages.
I am writing a program that performs a certain set of calculations on 
each row of a list of data, and here's what I have so far:

for (i in 1:2858) {
       
        Calc_1 <- some_stuff  
        Calc_2 <- some_more_stuff
        Calc_3 <- some_other_stuff

        Data_frame_name <- data.frame(Calc_1, Calc_2, Calc_3)
   
        write.table(Data_frame_name,file="~/file/goes/here.csv",
append
= FALSE, sep = "\t",row.names = FALSE, col.names =
c("Calc_1", "Calc_2",
"Calc_3"),qmethod = "double")
   
}


The naming of the data frame and the writing of the file go swimmingly, 
if I do it ONCE, outside of the for loop.  I want to embed the process 
in the for loop written above, run it 2858 times, and get that many data 
frames and .csv files that I can then manipulate.  In order to do so, I 
would like to name the data frames and/or files by their respective 
index, to get:
Data_frame_name1
Data_frame_name2
Data_frame_name3
...
Data_frame_name2858

I would also like to produce the .csv files:
~/file/goes/here1.csv
~/file/goes/here2.csv
~/file/goes/here3.csv
...
~/file/goes/here2858.csv

I've been noodling over this for a while and have looked all over but I 
can't seem to get the syntax right.  Any help at all would be appreciated.
Thanks again!
-Ken Ervin

Ken Ervin wrote:
> 
> 
> for (i in 1:2858) {
> ...
>         write.table(Data_frame_name,file="~/file/goes/here.csv",
append
> = FALSE, sep = "\t",row.names = FALSE, col.names =
c("Calc_1", "Calc_2",
> "Calc_3"),qmethod = "double")
>    
> }
> 
> 
> 
use something like

filename = paste("~/file/myfile",i,".csv",sep="") 

then 

... file = filename.

Dieter
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Sent from the R help mailing list archive at Nabble.com.

Do you really need to keep all 2858 dataframes around, or are you just
using them to create the object to write out?  If you really have to
keep that many, I would suggest that you use a list since you will
really polute your workspace with that many objects from the
standpoint if you ever wanted to do 'ls()' to see what objects you had
in the workspace.

On Wed, Oct 7, 2009 at 11:10 PM, Ken Ervin <ervinjudo at gmail.com>
wrote:
> Thanks in advance for reading my question.
> This is my first time working with R, though I have some intro-level
> experience with other languages.
> I am writing a program that performs a certain set of calculations on each
> row of a list of data, and here's what I have so far:
>
> for (i in 1:2858) {
> ? ? ? ? ? ? Calc_1 <- some_stuff ? ? ? ? Calc_2 <- some_more_stuff
> ? ? ? Calc_3 <- some_other_stuff
>
> ? ? ? Data_frame_name <- data.frame(Calc_1, Calc_2, Calc_3)
> ? ? ? ? write.table(Data_frame_name,file="~/file/goes/here.csv",
append > FALSE, sep = "\t",row.names = FALSE, col.names =
c("Calc_1", "Calc_2",
> "Calc_3"),qmethod = "double")
> ?}
>
>
> The naming of the data frame and the writing of the file go swimmingly, if
I
> do it ONCE, outside of the for loop. ?I want to embed the process in the
for
> loop written above, run it 2858 times, and get that many data frames and
> .csv files that I can then manipulate. ?In order to do so, I would like to
> name the data frames and/or files by their respective index, to get:
> Data_frame_name1
> Data_frame_name2
> Data_frame_name3
> ...
> Data_frame_name2858
>
> I would also like to produce the .csv files:
> ~/file/goes/here1.csv
> ~/file/goes/here2.csv
> ~/file/goes/here3.csv
> ...
> ~/file/goes/here2858.csv
>
> I've been noodling over this for a while and have looked all over but I
> can't seem to get the syntax right. ?Any help at all would be
appreciated.
> Thanks again!
> -Ken Ervin
>
> ______________________________________________
> 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.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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