Displaying 20 results from an estimated 800 matches similar to: "Infrequent but steady NULL-pointer caused segfault in as.POSIXlt.POSIXct (R 3.4.4)"
2019 Aug 04
1
Infrequent but steady NULL-pointer caused segfault in as.POSIXlt.POSIXct (R 3.4.4)
A reply from stackoverflow suggests I might have hit this bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=14023
I can confirm that this glibc bug affects my system (latest CentOS 7).
However, as far as I know, R is not multithreaded in its core. Is it
possible that some library triggered this?
Regards,
Steve
Tomas Kalibera <tomas.kalibera at gmail.com> ?2019?8?2??? ??4:59???
>
2019 Aug 02
0
Infrequent but steady NULL-pointer caused segfault in as.POSIXlt.POSIXct (R 3.4.4)
In an optimized build, debug info is just an approximation. It might
help to debug in a build of R and packages without compiler
optimizations (-O0), where the debug information is accurate. However,
first I would try to modify the example to trigger more often, or try to
find external ways to make it trigger more often (e.g. via gctorture).
Then I would try to make the example smaller (not
2015 Dec 07
2
inconsistency in POSIXlt
The documentation for the POSIXlt class states '"POSIXlt" objects will
often have an attribute "tzone", a character vector of length 3 giving the
time zone name from the TZ environment variable and the names of the base
time zone and the alternate (daylight-saving) time zone. Sometimes this may
just be of length one, giving the time zone
2015 Dec 07
0
inconsistency in POSIXlt
David,
I didn't have time to dig through the code completely, but those other two
are being set automatically in the C code as far as I can tell, in
particular in the code
// localtime may change tzname.
if (isgmt) {
PROTECT(tzone = mkString(tz));
} else {
PROTECT(tzone = allocVector(STRSXP, 3));
SET_STRING_ELT(tzone, 0, mkChar(tz));
SET_STRING_ELT(tzone, 1,
2008 Sep 04
1
Timezone support?
This is a follow-up to the thread ending with:
http://rubyforge.org/pipermail/vpim-talk/2008/000120.html
I too am in search of some ruby parser for icalendar which properly handles
timezones on the datetimes in the icalendar RFC.
As I understand it there are actually three types of times.
1) UTC times with a string form of yyyymmddThhmmssZ
note the trailing Z indicates zulu time aka utc.
2)
2003 Sep 05
1
Problem with S4 slots in C code (PR#4073)
This message is in MIME format. Since your mail reader does not understand
this format, some or all of this message may not be legible.
------_=_NextPart_000_01C3738F.63DE3390
Content-Type: text/plain;
charset="iso-8859-1"
#I want to be able to create a new S4 class and read data into it using C
code
# Here is a very simple S4 object inheriting from "array", but with 5
2005 Apr 12
5
How allocate STRSXP outside of gc
Hi,
I am trying to figure a way to allocate a string SEXP so that gc() won't
ever collect it.
Here is a little bit of a background. Suppose I want to write a
.Call-callable function that upon each call returns the same value, say
mkChar("foo"):
SEXP getFoo() {
return mkChar("foo");
}
The above implementation doesn't take advantage of the fact that
2004 Jun 14
5
mkChar can be interrupted
Hi,
As was discussed earlier in another thread and as documented in R-exts
.Call() should not be interruptible by Ctrl-C. However the following
code, which spends most of its time inside mkChar, turned out to be
interruptible on RH-7.3 R-1.8.1 gcc-2.96:
#include <Rinternals.h>
#include <R.h>
SEXP foo0(const SEXP nSexp) {
int i, n;
SEXP resSexp;
if (!isInteger(nSexp))
2006 Nov 17
1
Manipulating R lists in C
Hi,
I have been studying the R manual on lists but cannot seem to create a
simple R list in C - I keep on getting "'dimnames' applied to non-array"
whenever I attempt to assign names to the list elements:
Wanted output a list structure something like
[ type="Bid", price=2.0, volume=1000 ]
I can get up to a list of
[ "Bid2, 2.0, 1000 ]
But for the life of
2008 Oct 28
2
A question about the API mkchar()
Hi guys,
I've got a question about the API mkchar(). I have met some difficulty
in parsing utf-8 string to mkchar() in R-2.7.0.
I was intending to parse an utf-8 string str_jan (some Japanese
characters such as?, whose utf-8 code is E381B5) to R API SEXP
mkChar(const char *name) , we only need to create the SEXP using the
string that we parsed.
Unfortunately, I found when parsing the
2013 Jun 27
3
Read a text file into R with .Call()
Hi,
I want to read a text file into R with .Call().
So I define some NEW_CHARACTER() to store the chracters read and use SET_STRING_ELT to fill the elements.
e.g.
PROTECT(qNames = NEW_CHARACTER(10000));
char *foo; // This foo holds the string I want.
while(foo = readLine(FN)){
SET_STRING_ELT(qNames, i, mkChar(foo)));
}
In this way, I can get the desired character from qNames. The only problem
2008 Apr 14
1
clean-up actions after non-local exits
Dear R-devel,
Some time ago I started a thread that boiled down to clean-up actions after non-local exits in R, see below. I wonder if there has been any progress on this? R-ext 2.6.1 doesn't say much on the subject.
How, for example, do people deal with a situation where their C (C++) function opens a file and then receives a signal or longjump-s on error(), how do they make sure the
2014 Jun 26
1
using 2D array of SEXP for creating dataframe
Hi ,
For our production package i need to create a dataframein C . So I wrote
the following code
SEXP dfm ,head,df , dfint , dfStr,lsnm;
*SEXP valueVector[2];*
char *ab[3] = {"aa","vv","gy"};
int sn[3] ={99,89,12};
char *listnames[2] = {"int","string"};
int i,j;
//=============================
PROTECT(df = allocVector(VECSXP,2));
2014 Mar 06
1
Create dataframe in C from table and return to R
Hi ,
I am trying to create a dataframe in C and sebd it back to R. Can anyone
point me to the part of the source code where it is doing , let me explain
the problem I am having .
--------------------------------------------------------------------
My simple implementation is like this
SEXP formDF() {
SEXP dfm ,df , dfint , dfStr,lsnm;
char *ab[3] =
2009 Jun 26
1
bug in Rf_PrintValue ?
I'm very green with R, so maybe this is not a bug, but it looks like one to
me. The following program segfaults at the second call to Rf_PrintValue().
To failure depends on the value of the y-string. E.g., if I change it from
"coverage" to, say, "COVERAGE", the segfault does not occur.
/* bug.c */
#include <stdio.h>
#include <Rinternals.h>
#include
2004 Jun 30
2
Slow IO: was [R] naive question
I believe IO in R is slow because of the way it is implemented, not
because it has to do some extra work for the user.
I compared scan() with 'what' argument set (which is, AFAIK, is the
fastest way to read a CSV file) to an equivalent C code. It turned out
to be 20 - 50 times slower.
I can see at least two main reasons why R's IO is so slow (I didn't
profile this though):
A) it
2004 Jun 08
5
fast mkChar
Hi,
To speed up reading of large (few million lines) CSV files I am writing
custom read functions (in C). By timing various approaches I figured out
that one of the bottlenecks in reading character fields is the mkChar()
function which on each call incurs a lot of garbage-collection-related
overhead.
I wonder if there is a "vectorized" version of mkChar, say mkChar2(char
**, int
2004 Mar 17
1
best methods for strings and structures?
I'm trying to generate an R interface for a library that's commonly used and
I'm currently writing wrapper functions for file i/o and return an object
(list?) that contains the elements of the C structure. For example, reading
a file that contains:
struct CONFIG_RECORD
{
char coeffs_filename[256];
char species_filename[256];
unsigned long
2016 May 12
3
Suggestion: mkString(NULL) should be NA
I would like to propose that Rf_mkString(NULL) and Rf_mkChar(NULL)
return NA rather than segfault.
Case: the mkString() and mkChar() functions are convenient to wrap
strings returned by e.g. external C libraries into an R vector.
However sometimes a library returns NULL instead of a string when the
result is unavailable. In some C libraries this can happen
unexpectedly or is even undocumented.
A
2009 Mar 30
1
Setting the names attribute of a list?
Hello,
I have created a vector with 2 elements(see code below)
I am calling this function many thousands of times (hundreds of
thousands) after some time
i get
*** caught segfault ***
address 0x5, cause 'memory not mapped'
However, if i dont set the R_NamesSymbol, I do not get any such error.
Am I doing this correctly?
Thank you
Saptarshi
==CODE===
// kxp and usar are two SEXP's