R help - Jan 2013 - For loop on data frame

I am a beginner in R.
I wrote a function to read a data frame from a file and then split it
into certain number of data frames and write each one of them  in a
separate txt file.
the function is working perfectly for the first four files the it
gives me files contain one column of NA values.

split= function (filename,linesno,filesno) {
                        i=1
                        j=linesno
                        k=1
                        e=1
                        x=read.table(filename, sep=("\t"), header=
FALSE)
                        for (i in 1:filesno){
                                xx=x[e:j, ]
                                l=paste0(filename,0,k,".pdb")
                                write.table(xx, l, quote =FALSE, sep
"\t",row.names = FALSE, col.names = FALSE)
                                k=k+1
                                e=e+j
                                j=2*j
                                }
        }
what could be the problem?
Esam

Your example is not reproducible. See
http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example

I would guess you have tabs at the ends of your lines in the input file. This is
a fairly common problem when you muck with data in Excel.

To find these problems yourself, learn to examine the objects you create by
executing the statements one-to-one and interspersing ?str calls and printing
objects so you understand what the code is working with.
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Esam Tolba <eatolba at gmail.com> wrote:
>I am a beginner in R.
>I wrote a function to read a data frame from a file and then split it
>into certain number of data frames and write each one of them  in a
>separate txt file.
>the function is working perfectly for the first four files the it
>gives me files contain one column of NA values.
>
>split= function (filename,linesno,filesno) {
>                        i=1
>                        j=linesno
>                        k=1
>                        e=1
>                      x=read.table(filename, sep=("\t"), header=
FALSE)
>                        for (i in 1:filesno){
>                                xx=x[e:j, ]
>                                l=paste0(filename,0,k,".pdb")
>                                write.table(xx, l, quote =FALSE, sep
>"\t",row.names = FALSE, col.names = FALSE)
>                                k=k+1
>                                e=e+j
>                                j=2*j
>                                }
>        }
>what could be the problem?
>Esam
>
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>and provide commented, minimal, self-contained, reproducible code.