Displaying 20 results from an estimated 2000 matches similar to: "readBin() arg check has unnecessary overhead (patch included)"
2009 Feb 04
2
Capturing all warnings (with messages)
Dear all,
For an open-source project that I'm working on (1), which uses R for
all its heavy lifting but includes a wrapper shell script, I was
hoping to find a way to capture all warnings (and, in fact, errors
too), and handle them in my own way. I realise I can do this for a
single expression using something like:
> f <- function(w) print(w$message)
>
2008 Sep 24
2
R --interactive and readline() creates infinite loop
Dear all,
I have asked before, in R-help [1], about a way to create an
interactive session in which commands are taken from a file or
standard input - like R CMD BATCH but additionally allowing user input
- but there was no response to that question, and the workarounds that
I have found (using "expect", creating a temporary .Rprofile) are ugly
and problematic.
With the
2010 Jul 16
2
Creating an environment with attributes in a package
Dear all,
I am trying to create an environment object with additional attributes, viz.
Foo <- structure(new.env(), name="Foo")
Doing this in a standard session works fine: I get the environment
with attr(,"name") set as expected. But if the same code appears
inside a package source file, I get just the plain environment with no
attributes set. Using a non-environment
2009 May 20
0
New package for medical image manipulation: tractor.base
Dear all,
The "tractor.base" package has recently been added to CRAN. This
package provides functions to read, write, visualise and manipulate
magnetic resonance images. The standard Analyze, NIfTI and DICOM file
formats are supported (read-only for DICOM), and all metadata is
stored with the image data internally. The code can be used to
visualise image slices or maximum intensity
2009 May 20
0
New package for medical image manipulation: tractor.base
Dear all,
The "tractor.base" package has recently been added to CRAN. This
package provides functions to read, write, visualise and manipulate
magnetic resonance images. The standard Analyze, NIfTI and DICOM file
formats are supported (read-only for DICOM), and all metadata is
stored with the image data internally. The code can be used to
visualise image slices or maximum intensity
2011 May 04
1
General "nil" reference class object
Dear John and others,
I've been wondering about whether there's any way to indicate a "nil"
reference class object, which will represent "no value", and be tested
for, but not fail the internal type checking. NULL is the obvious
choice (or seems so to me), but can only be used if an explicit class
union is created:
> Foo <- setRefClass("Foo")
> Bar
2012 Apr 11
0
Significant updates to medical imaging packages: TractoR and RNiftyReg
Dear all,
There have been some recent major updates to the TractoR and RNiftyReg
packages, which are available for medical image analysis applications.
If you use R for these purposes, I hope you will find the updates
useful.
RNiftyReg is an image registration package, which provides a clean
R-like interface to the NiftyReg library developed at University
College London [1]. It is aimed at
2012 Apr 11
0
Significant updates to medical imaging packages: TractoR and RNiftyReg
Dear all,
There have been some recent major updates to the TractoR and RNiftyReg
packages, which are available for medical image analysis applications.
If you use R for these purposes, I hope you will find the updates
useful.
RNiftyReg is an image registration package, which provides a clean
R-like interface to the NiftyReg library developed at University
College London [1]. It is aimed at
2007 Jan 26
1
readBin is much slower for raw input than for a file
Dear all,
I'm trying to write an efficient binary file reader for a file type
that is made up of several fields of variable length, and so requires
many small reads. Doing this on the file directly using a sequence of
readBin() calls is a bit too slow for my needs, so I tried buffering
the file into a raw vector and reading from that ("loc" is the
equivalent of the file pointer):
2007 Jan 26
1
readBin is much slower for raw input than for a file
Dear all,
I'm trying to write an efficient binary file reader for a file type
that is made up of several fields of variable length, and so requires
many small reads. Doing this on the file directly using a sequence of
readBin() calls is a bit too slow for my needs, so I tried buffering
the file into a raw vector and reading from that ("loc" is the
equivalent of the file pointer):
2008 Apr 28
4
R 2.7.0, match() and strings containing \0 - bug?
Hi,
A piece of my code that uses readBin() to read a certain file type is
behaving strangely with R 2.7.0. This seems to be because of a failure
to match() strings after using rawToChar() when the original was
terminated with a "\0" character. Direct equality testing with ==
still works as expected. I can reproduce this as follows:
> x <- "foo"
> y <-
2011 Mar 29
2
Reading 64-bit integers
Dear all,
I see from some previous threads that support for 64-bit integers in R
may be an aim for future versions, but in the meantime I'm wondering
whether it is possible to read in integers of greater than 32 bits at
all. Judging from ?readBin, it should be possible to read 8-byte
integers to some degree, but it is clearly limited in practice by R's
internally 32-bit integer type:
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
2011 Sep 23
2
Issue with seek() on gzipped connections in R-devel
Dear all,
In R-devel (2011-09-23 r57050), I'm running into a serious problem
with seek()ing on connections opened with gzfile(). A warning is
generated and the file position does not seek to the requested
location. It doesn't seem to occur all the time - I tried to create a
small example file to illustrate it, but the problem didn't occur.
However, it can be seen with a file I use for
2006 Sep 27
2
Single Precision (4 byte) floats with readBin
I would like to use readBin to read a binary data
file. Most of the data is 4-byte floating point but,
for some reason, only double precision appears to be
offered. I tried
fVariable=readBin(iFile,what=single());
and got 35.87879 which looks believable except that
the correct value is 3.030303. I then tried
fVariable=readBin(iFile,what=single(),4);
and got
[1] 3.831111e+10 6.657199e+10
2009 May 18
2
readBin on binary non-blocking connections (Windows & Unix differences/bugs)
R-devel:
I am encountering a consistency issue using socketConnection and
readBin with *non-blocking* connections on Unix and Windows XP (no
Vista to test).
I am a bit confused by the behavior of *non-blocking* connections
under Windows specifically. When calling readBin on a non-blocking
connection when there is no data to read on the socket, the connection
under Unix will return a vector of
2002 Mar 05
3
reading 2-byte integers using readBin and connections
Hi folks:
This may be a stupid question, but I cannot seem to find a way to tell
readBin that I want to read 2-byte integers from the connection. The input
file is 150,720 bytes long containing 75,360 short (2-byte) integers. But
specifying "integer" or "int" for what in readBin only returns me a vector
of length 37680, leading me to believe that sizeof(integer) or
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
2009 May 11
3
readBin: read from defined offset TO defined offset?
Hello,
With the help of "seek" I can start "readBin" from any byte offset within my
file that I deem appropriate.
What I would like to do is to be able to define the endpoint of that read as
well. Is there any solution to that already out there?
Thanks for any hints, Joh
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}}
+