[R] Automating R for multiple data files

[Prof Brian Ripley]

On Thu, 1 May 2003, Adam Tee wrote:

> Hi,
> 
> I'm new to R and have looked at the mail archives and not
> seen a solution to my problem.
> 
> I have a set of data files with filenames in the following form
> haydn1stmvt.jtf.sim0.142292.et.dist, where the latter half
> changes, after the jtf.
> 
> What I am trying to do is process the set of these files using
> R's batch mode. using the following :
> 
> library(mva)
> 
> mdsdata <- read.table(file)
> cm <- cmdscale(mdsdata)
> x <- cm[,1]
> y <- -cm[,2]
> 
> postscript("file.eps", height=5, width=5)
> plot(x,y,type="n", main="classical MDS")
> text(x,y,names(mdsdata))
> dev.off()
> 
> I want the variable file to contain the relevant file name with
> having to input it manually for each file. Is there an easy solution to 
> this ??

files <- list.files(pattern="^haydn1stmvt.jtf")

and then a for loop over `files' would appear to do what I think (but am 
unsure) you want.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595