[R] Using loop numbers in write.csv

[Economics Guy]

Thanks!

Double thanks to Phil, I used your guide to learn LaTeX many moons ago.

On Thu, Mar 13, 2008 at 1:26 PM, Greg Snow <Greg.Snow at imail.org> wrote:
>
>  For filenames you can do something like:
>
>   file = paste("resultsMatrix_', i, sep='')
>
>  For naming objects in the workspace, there is a way, but you really
>  don't want to do that.  It is better to store them in a list, for
>  example:
>
>  resultList <- list()
>
> for( i in 1:10){
>         resultList[[i]] <-  matrix(runif(25, 0, 1),5, 5)
>    }
>
>  If you want the elements of the list named you can do:
>
>  names( resultList ) <- paste('resultMatrix_',1:10, sep='')
>
>  Now you have 10 matricies all grouped together in a list, you can access
>  a single matrix like resultList[[1]] or resultList$resultMatrix_1, or
>  you can do something to all of them using lapply or sapply.  You are
>  much less likely to overwrite data by accident, you can save, copy,
>  load, delete, etc the whole set in 1 step rather than using a loop.
>
>  Hope this helps,
>
>  --
>  Gregory (Greg) L. Snow Ph.D.
>  Statistical Data Center
>  Intermountain Healthcare
>  greg.snow at imail.org
>  (801) 408-8111
>
>
>
>
>
>  > -----Original Message-----
>  > From: r-help-bounces at r-project.org
>  > [mailto:r-help-bounces at r-project.org] On Behalf Of Economics Guy
>  > Sent: Thursday, March 13, 2008 11:07 AM
>  > To: r-help at stat.math.ethz.ch
>  > Subject: [R] Using loop numbers in write.csv
>  >
>  > This is a question I have wanted to ask for a while but
>  > hesitated because I was sut sure I would find the answer on
>  > my own, but as of yet...no dice.
>  >
>  > 1) Is there a way to use the loop number in naming things in R.
>  > Specifically I have  a simulation that has two loops. I would
>  > like to be able to write out the results to a csv file after
>  > each iteration.
>  >
>  > something like:
>  >
>  >
>  >         for (i in 1:10){
>  >
>  >               exampleMatrix <-  matrix(runif(25, 0, 1),5, 5)
>  >
>  >               write.csv(exampleMatrix, file = "resultsMatrix_i.csv")
>  >
>  >               }
>  >
>  > Where I would get 10 csv files named resultsMatrix_1,
>  > resultsMatrix_2 ... resultsMatrix_10.
>  >
>  >
>  > 2) On a similar note is there a way to use the loop number
>  > when naming things.
>  >
>  > something like:
>  >
>  >
>  >         for (i in 1:10){
>  >
>  >               exampleMatrix_i <-  matrix(runif(25, 0, 1),5, 5)
>  >
>  >               }
>  >
>  > Where I would then have 10 matrices in memory with the names
>  > exampleMatrix_1, exampleMatrix_2 ... exampleMatrix_10.
>  >
>  > Thanks,
>  >
>  > EG
>  >
>
>
> > ______________________________________________
>  > 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.
>  >
>
>



-- 
Robi Ragan
Graduate Student
Department of Economics
Department of Political Science
The University of Georgia
robi.myweb.uga.edu