write.table file="file.txt" help

Hi all,

I have a R script that creates several input files for an analysis 
program.  It loops through the matrix read into R and picks out 
submatrices and then creates a separate output file for each 
submatrix.  The loop works great, but I am having trouble getting all 
the separate output files written.

The line I have is:

write.table(ch1d, file="C:/WINDOWS/Desktop/SNPs/haplo.txt", 
row.names=F, col.names=F, append=F, quote=F)

Which works just fine if I just wanted to create a single file from the 
loop.  However, I need to somehow get it to change the name of the 
output file ("haplo.txt") each time it goes through the loop so it 
doesn't overwrite each time.  In perl, I'd create $n=1 and increment up 
each loop, and call the file something like "haplo.txt.$n"  

I tried to do something like that but R doesn't recognize the variable 
that would be $n in perl (because it's part of the quoted name of the 
output file).  Adding it after the ending " just gave me an error, as I 
thought it would.

I also tried to use system(copy ...) to change the name of the file in 
dos, but my knowledge of dos is abysmal, so I was unable to do it.

Any ideas on how to go about doing this would be most appreciated!

Thanks in advance,
KK Nicodemus

I have problems running R with screen. For those who don't know,
screen is a unix tool that is quite handy if you want to leave
a process (that outputs to tty) running when you logout, and
then recover the session later on.

It works like this:
1) run 'screen': you get a normal prompt as if you were in a normal
shell.
2) run whatever command you like
3) press 'C-a d' to detach the session. Now you can logoff if you like
4) when you want to recover the session type 'screen -r'

The problem is that R seems to catch the 'C-a' signal, and nothing happens.
Since there is no way to detach the screen, there is no use to it either.

Is there a way around this problem?

Giampiero

I have problems running R with screen. For those who don't know,
screen is a unix tool that is quite handy if you want to leave
a process (that outputs to tty) running when you logout, and
then recover the session later on.

It works like this:
1) run 'screen': you get a normal prompt as if you were in a normal
shell.
2) run whatever command you like
3) press 'C-a d' to detach the session. Now you can logoff if you like
4) when you want to recover the session type 'screen -r'

The problem is that R seems to catch the 'C-a' signal, and nothing happens.
Since there is no way to detach the screen, there is no use to it either.

Is there a way around this problem?

Giampiero

I have problems running R with screen. For those who don't know,
screen is a unix tool that is quite handy if you want to leave
a process (that outputs to tty) running when you logout, and
then recover the session later on.

It works like this:
1) run 'screen': you get a normal prompt as if you were in a normal
shell.
2) run whatever command you like
3) press 'C-a d' to detach the session. Now you can logoff if you like
4) when you want to recover the session type 'screen -r'

The problem is that R seems to catch the 'C-a' signal, and nothing happens.
Since there is no way to detach the screen, there is no use to it either.

Is there a way around this problem?

Giampiero

C-a is not a `signal' but a normal key sequence, and one used by
readline.  However,

screen R
ctrl-a d
[detached]
screen -r

works for me apart from not having the usual meaning of crtl-a.  I don't
think R is doing anything special, but some versions of readline could
conceivably be.

I used RH8.0 Linux for this test.  I would suggest trying R --no-readline
in case your version of readline is setting the terminal in a way that
conflicts with your version of `screen'.

On Tue, 27 Jan 2004, Giampiero Salvi wrote:

I have problems running R with screen. For those who don't know,
screen is a unix tool that is quite handy if you want to leave
a process (that outputs to tty) running when you logout, and
then recover the session later on.

It works like this:
1) run 'screen': you get a normal prompt as if you were in a normal
shell.
2) run whatever command you like
3) press 'C-a d' to detach the session. Now you can logoff if you like
4) when you want to recover the session type 'screen -r'

The problem is that R seems to catch the 'C-a' signal, and nothing happens.
Since there is no way to detach the screen, there is no use to it either.

Is there a way around this problem?

Giampiero

--
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