Displaying 20 results from an estimated 3000 matches similar to: "readBin or writeBin adds extra nulls (PR#2333)"
2006 Jun 02
1
Typo fix for readBin.Rd
Hi,
The man page for readBin has a small typo:
--- a/src/library/base/man/readBin.Rd
+++ b/src/library/base/man/readBin.Rd
@@ -58,7 +58,7 @@ writeBin(object, con, size = NA, endian
\code{readBin} and \code{writeBin} read and write C-style
zero-terminated character strings. Input strings are limited to 10000
- characters. \code{\link{readChar}} and \code{\code{writeChar}}
+
2003 Nov 14
2
writeChar potential buffer overrun (PR#5090)
Trying to copy the (binary) header of a input file directly
to an output file, I've had repeatable seg faults. The call:
writeChar(hdr, outfh, nchars=6144)
when hdr just contains one empty string seems to be the
culprit. The stack traces weren't all that illuminating,
with sig 11 in memory-related functions following this. But
in src/main/connections.c it looks like do_writechar
2011 Feb 04
2
Strange behaviour of read and writeBin
To me it seems like writeBin() writes one char/byte more than expected.
> con <- file("testbin", "wb")
> writeBin("ttccggaa", con)
> close(con)
> con <- file("testbin", "rb")
> readBin(con, what="character")
[1] "ttccggaa"
> seek(con, what=NA)
[1] 9
> close(con)
> con <-
2002 Apr 26
4
Memory "leak" in readChar (PR#1483)
Full_Name: Hugh C. Pumphrey
Version: 1.4.1
OS: Linux (Debian Woody)
Submission from: (NULL) (129.215.133.170)
The function readChar() appears to have some type of problem with memory
allocation.
I don't know if "memory leak" is the correct term but if one uses readChar()
many
times, the R binary grows in size until it eats all your memory and swap space.
The code enclosed below
2006 Mar 30
1
Writing character vectors with embedded nulls to a connection
Is this possible? I've tried both writeChar() and writeBin() to no avail.
My goal is to serialize(ascii=FALSE) an object to a connection but
determine the size of the serialized object before hand:
sobject <- serialize(object,NULL,ascii=FALSE)
len <- nchar(sobject)
#
# run some code here to notify listener on other end of connection
# how many bytes I'm getting ready to send
#
2001 Dec 07
2
Memory problem
Dear all,
I have written a little R program to convert images. See below. Within the
loop over j (the filenames) memory consumption grows constantly. rm( ... )
inside the loop did not help. Memory does not grow if I remove the writeBin
statements between the two #-------- marks. But obviously this is not
solution I want...
Thanks for any advice.
Manfred Baumstark
P.S. As I'm new to R:
2012 May 03
2
Help with readBin
I'm trying to read a binary file created by a fortran code using readBin
and readChar. Everything reads fine (integers and strings) except for
double precision numbers, they are read as huge or very small number
(1E-250,...). I tried various endianness, swap, But nothing has worked so
far.
I also tried on R 64 bit for linux and windows (R 2.14) and R 2.11 on
windows XP 32 bit.
Any help would
2002 Oct 07
2
Error in writeBin(object, con, size = 2)
Hi all,
I wrote a function (in R batch mode) which reads binary data,
interpolates sometimes and wrote a new binary file of the same size as
the input file. Her is a bit of code:
while (length( head <- readBin(si, integer(), 64, size=2))) {
data <- readBin(si, integer(), head[5], size=2)
## now write head to new file
writeBin(head, so, size=2)
## if head[4] is 9 or
2002 Jun 18
3
Maybe a problem in binary read/write (PR#1688)
Full_Name: Johnny Accot
Version: 1.5.1
OS: Linux
Submission from: (NULL) (198.4.83.52)
Hi.
I'm having a problem with the binary read/write functions. I'm writing a device
driver in R (why not?) and of course I have to send a couple commands to the
device. Typically, I send one byte, receive one acknowledgement byte, send
another byte, receive an ACK, and so on. At least this is what
2005 Oct 12
1
Questions about readBin function (Was: dec2bin?)
Hi,
The latest version of R had some changes to functions "readbin() and
writeBin() [which] now support raw vectors as well as filenames and
connections.". As a result I am working on retiring "raw2bin" and "bin2raw"
functions from "caTools" package which do exactly the same. Thanks to Prof.
Ripley for bringing this change to my attention.
Which brings me
2006 Jun 28
2
read file with readBin (the file was saved with a C-routine)
Hello!
I have problems with using of "readBin" to read files, which was written in C with "fwrite". In the C-File there is the following Code:
fwrite(MyitINI,sizeof(itINItype),1,outfile);
where MyitINI is a structure of the following form
typedef struct{
int KernelFileSave; /* Determined, if Systemmatrix saved or not.*/
char KernelFileName[200]; /* A-Matrix name
2012 Jun 12
1
Reading binary files
Hey guys,
I am currently trying to read in a binary file using this helpful manual:
http://www.ats.ucla.edu/stat/r/faq/read_binary.htm Reading binary files
I also have the detailed format description from the developer. But somehow
the reading of the file does still not work properly. The first entry in the
file is the following, according to the manufacturer:
"String containing 4 one-byte
2010 May 05
1
handling nulls while reading mainframe file
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
2010 Jan 07
2
Problem with writeBin and importing into gfortran compiled programs
Hi all,
I'm having problems trying to export binary arrays from R and importing
them into fortran (linux openSUSE 10.3 (x86_64), gfortran compiler,
fortran 90/95 program).
Let's say the problem can be expressed as:
R part
------------
>whini <- runif(1000)
>writeBin(whini,"fwhini.dat")
f90 part
------------
PROGRAM foo
INTEGER, PARAMETER :: DP = KIND(1.0D0)
INTEGER ::
2007 Dec 31
1
readBin differences on Windows and Linux/mac
I have been trying to use the gunzip function in the R.utils package. It
opens a connection to a gzfile, uses readBin to read from that connection,
and then uses writeBin to write out the raw data to a new file. This works
as expected under linux/mac, but under Windows, I get:
Error in readBin(inn, what= raw(0), size = 1, n=BFR.SIZE) :
negative length vectors are not allowed
A simple
2019 Nov 18
2
readBin should check that its endian argument is a legal value
I think it would be helpful if readBin checked that its endian argument is
a legal value.
Why? I was reviewing some of our code and noticed that the author had
readBin(..., endian="network") and never having heard of "network", I
looked at the man page for readBin, and it hadn't heard of "network"
either. Not good.
I then looked at the R code for readBin, which
2008 Jan 23
0
writeBin doesn't "send" until readBin executed
Hi all -
I'm playing around with an attempt to do some serial communication from
within R to a microcontroller board. I open a connection:
zz = file("/dev/ttyUSB0",open="a+") ## text mode
... when I execute
writeLines("0",con=zz)
I know the board receives the "0" because the board's serial comm LEDs light
up when submit the command at the R
2006 Nov 09
2
Single precision data behaviour with readBin()
Hi all,
I am running R version 2.4.0 (2006-10-03) on an i686 pc with Mandrake
10.2 Linux. I was given a binary data file containing single precision
numbers that I would like to read into R. In a previous posting,
someone suggested reading in such data as double(), which is what I've
tried:
> zz <- file(file, "rb")
> h1 <- readBin(con = zz, what = double(), n = 1, size
2013 May 08
1
getting corrupted data when using readBin() after seek() on a gzfile connection
Hi,
I'm running into more issues when reading data from a gzfile connection.
If I read the data sequentially with successive calls to readBin(), the
data I get looks ok. But if I call seek() between the successive calls
to readBin(), I get corrupted data.
Here is a (hopefully) reproducible example. See my sessionInfo() at the
end (I'm not on Windows, where, according to the man page,
2012 Feb 15
1
Using readBin to read binary "unformatted" output files from Fortran?
Hello,
I'm wondering if I can get some help with reading Fortran binary "unformatted" output files into R.
The Fortran output files were generated in Ubuntu 10.04 LTS using gfortran4.4, on a 32bit Intel Core 2 Duo 3.16 GHz machine, with little-endian and record marker lengths equal to 4.
The machine I'm currently trying to read this Fortran output file is a Macbook Pro