Thanks. Once I have my cleaned up raw vector, I need to convert to
characters using the ebcdic code page. I could first convert it to
characters using rawToChar() (which will give me garbled ascii), and then
convert that to ebcdic using iconv(). If anyone knows of a more direct
solution, let me know.
On Wed, May 5, 2010 at 9:18 PM, jim holtman <jholt...@gmail.com> wrote:
> Try using readBin and 'raw'
>
> x <- readBin('yourFile', 'raw', n=1e6)
>
> You can then scan 'x' and replace NULLs (I assume they are 0x00) with
> whatever you want.
>
> > str(x)
> raw [1:10] 00 00 22 00 ...
> > x
> [1] 00 00 22 00 00 00 00 00 00 00
> > x[x == as.raw(0)] <- as.raw(0xab)
> > x
> [1] ab ab 22 ab ab ab ab ab ab ab
> >
>
>
> On Wed, May 5, 2010 at 1:07 PM, Michael Steven Rooney <
> michael.s.roo...@gmail.com> wrote:
>
>> Hi,
>>
>> I am trying to read in records from an old main frame file. Each record is
>> 640 bytes. I had some success using the following statement:
>>
>> iconv(readChar(con, nchars=640, useBytes =
>> TRUE),from="IBM037",to="",sub="#")
>>
>> What I have found, however, is that ocassionally a record will contain a
>> Null halfway through, which causes readChar() not to read the rest of the
>> record. It is a very old database (from the 1970s I think), and I am not
>> really sure why the Nulls are there. I do know that that after the
>> occurence
>> of the first Null, the record looks normal (it's not Nulls to the 640th
>> byte). In any case, I would like to get the whole record and just put some
>> placeholder, like a 0 or a #, in place of the Nulls.
>>
>> I tried using readBin() instead, but I couldn't figure out how to pass
>> that
>> off to iconv...
>>
>> Can anyone help?
>>
>> Thanks,
>> Mike
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>
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