R help - May 2003 - Automating R for multiple data files

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

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 ??


Thanks

Adam Tee
PhD Student
University of Leeds