R help - May 2006 - writing 100 files

Hi All,

I need to write as text files 1000 ish variation of the same data frame, 
once I permute a row.

I would like to use the function write.table() to write the files, and 
use a loop to do it:

for (i in 1:1000){

bb8[2,] = sample(bb8[2,])
write.table(bb8, quote = F, sep = '\t', row.names = F, col.names = F, 
file = 'whatever?????.txt')
}
so all the files are called whatever1: whatever1000

Any idea?

Cheers,

Federico

-- 
Federico C. F. Calboli
Department of Epidemiology and Public Health
Imperial College, St Mary's Campus
Norfolk Place, London W2 1PG

Tel  +44 (0)20 7594 1602     Fax (+44) 020 7594 3193

f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com

On 5/22/2006 11:24 AM, Federico Calboli wrote:
> Hi All,
> 
> I need to write as text files 1000 ish variation of the same data frame, 
> once I permute a row.
> 
> I would like to use the function write.table() to write the files, and 
> use a loop to do it:
> 
> for (i in 1:1000){
> 
> bb8[2,] = sample(bb8[2,])
> write.table(bb8, quote = F, sep = '\t', row.names = F, col.names =
F,
> file = 'whatever?????.txt')
> }
> so all the files are called whatever1: whatever1000
> 
> Any idea?
Use the paste() function to construct the name, e.g.

file = paste("whatever",i,".txt", sep="")

Duncan Murdoch

On Mon, 2006-05-22 at 16:24 +0100, Federico Calboli
wrote:
> Hi All,
> 
> I need to write as text files 1000 ish variation of the same data frame, 
> once I permute a row.
> 
> I would like to use the function write.table() to write the files, and 
> use a loop to do it:
> 
> for (i in 1:1000){
> 
> bb8[2,] = sample(bb8[2,])
> write.table(bb8, quote = F, sep = '\t', row.names = F, col.names =
F,
> file = 'whatever?????.txt')
> }
> so all the files are called whatever1: whatever1000
> 
> Any idea?
> 
> Cheers,
> 
> Federico

The same process used in R FAQ 7.34: 

  How can I save the result of each iteration in a loop into a separate
  file?

can be used here.  Instead of using save(), use write.table(), adjusting
the arguments accordingly.

HTH,

Marc Schwartz

Federico Calboli wrote:
> Hi All,
> 
> I need to write as text files 1000 ish variation of the same data frame, 
> once I permute a row.
> 
> I would like to use the function write.table() to write the files, and 
> use a loop to do it:
> 
> for (i in 1:1000){
> 
> bb8[2,] = sample(bb8[2,])
> write.table(bb8, quote = F, sep = '\t', row.names = F, col.names =
F,
> file = 'whatever?????.txt')
> }
> so all the files are called whatever1: whatever1000
> 
> Any idea?
> 
> Cheers,
> 
> Federico
> 
This is the FAQ "How can I save the result of each iteration in a loop 
into a separate file?"

Please read the FAQs prior to posting!

Uwe Ligges