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Non-standard characters in Ascii-Files

3 messages · Schneider, Manuel, Peter Dalgaard, Henrik Bengtsson

Original
Schneider, Manuel
# 
Dear R-list

In R 2.1.1 under Win XP on a P4 with 2GB Ram when typing
I receive:
Error in scan("temp.txt") : scan() expected 'a real', received '414851'

The motivation for evoquing this meassage is that I am getting the same
meassage with exported Ascii-Files from the GIS. The files contain very
few, randomly scattered non-standard Ascii-characters. This seems to be
a local problem on my machine but I do not have a clue on the reason
(OS, Memory, HD?) nor who to ask. 
So, my apologies for misusing this list and many thanks for any
suggestion.

Kind regards
Manuel
Peter Dalgaard
# 
"Schneider, Manuel" <Manuel.Schneider at eawag.ch> writes:
I tried this on a Linux box (with a somewhat outdated R version though),
and apart from eating up memory and disk space, nothing untoward seems
to happen:
Read 16000000 items

I'd suspect your harddisk or the disk controller...
Henrik Bengtsson
#
Peter Dalgaard wrote:
and on my R v2.1.1 patched (2005-08-25) on WinXP Pro SP2 (sic!), I get

 > temp<-matrix(c(1:16000000),4000,4000)
 > write(file="temp.txt", temp)
 > file.info("temp.txt")$size
[1] 136088897
 > rm(temp)
 > dummy <- scan("temp.txt")
Read 16000000 items
I second this, check the file with an external application or try the 
following ad-hoc code:

zcan <- function(filename) {
   fh <- file(filename, open="r");
   on.exit(close(fh));
   count <- 0;
   while(TRUE) {
     s <- readChar(fh, n=1024);
     if (nchar(s) == 0)
       break;
     count <- count + nchar(s);
     if (gsub("[\n 0-9]*", "", s) != "")
       stop("Error after reading ", count, " characters: ", s);
   }
}

Cheers

Henrik