[datatable-help] R Studio Interactions with data.table

[Kevin Ushey]

FWIW, I can reproduce this segfault within the console as well,
including with the latest SVN version of data.table 1.9.3.

Running under R -d lldb, I don't get a segfault off the bat; I get:

> dt[,forward_date:=c(rep(NA,5),date),by='strip']

Warning message:

In `[.data.table`(dt, , `:=`(forward_date, c(rep(NA, 5), date)),  :
  RHS 1 is length 15 (greater than the size (10) of group 1). The last
5 element(s) will be discarded.

I also see the error, if I play around in the console a bit after launching R:

> dt[,forward_date:=c(rep(NA,5),date),by='strip']

Process 55776 stopped

* thread #1: tid = 0x13b169, 0x000000010002bf60
libR.dylib`Rf_copyMostAttrib(inp=0x0000000101bb0f50,
ans=0x0000000101bb0ea8) + 192 at attrib.c:274, queue =
'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1,
address=0x417e)

    frame #0: 0x000000010002bf60
libR.dylib`Rf_copyMostAttrib(inp=0x0000000101bb0f50,
ans=0x0000000101bb0ea8) + 192 at attrib.c:274
   271     PROTECT(ans);
   272     PROTECT(inp);
   273     for (s = ATTRIB(inp); s != R_NilValue; s = CDR(s)) {
-> 274 if ((TAG(s) != R_NamesSymbol) &&
   275     (TAG(s) != R_DimSymbol) &&
   276     (TAG(s) != R_DimNamesSymbol)) {
   277     installAttrib(ans, TAG(s), CAR(s));

Hopefully this gives a starting point in debugging...

Kevin

On Tue, Apr 22, 2014 at 11:07 AM, Zachary Long <long at dc-energy.com> wrote:
> Hello,
>
> I was wondering if an error like this had been addressed before. I am using
> data table 1.9.2.
>
> It appears that the error has to do with the interaction with R-Studio. When
> I run
>
> library(data.table)
> dt<-data.table(strip="Nov08",date=c("2006-08-01","2006-08-02","2006-08-03","2006-08-04","2006-08-07",
>
> "2006-08-08","2006-08-09","2006-08-10","2006-08-11","2006-08-14"))
> dt[,forward_date:=c(rep(NA,5),date),by='strip']
>
>
> The result I expect is below, along with a warning message.
>
> strip       date forward_date
>  1: Nov08 2006-08-01           NA
>  2: Nov08 2006-08-02           NA
>  3: Nov08 2006-08-03           NA
>  4: Nov08 2006-08-04           NA
>  5: Nov08 2006-08-07           NA
>  6: Nov08 2006-08-08   2006-08-01
>  7: Nov08 2006-08-09   2006-08-02
>  8: Nov08 2006-08-10   2006-08-03
>  9: Nov08 2006-08-11   2006-08-04
> 10: Nov08 2006-08-14   2006-08-07
>
>
> However, I don't get this.
>
> 1 of two things can happen.
>
> 1. My R-Studio will completely crash without warning. All unsaved
> information is lost.
> 2. I can get "Error: Value of SET_STRING_ELT() must be a 'CHARSXP' not a
> 'character'" "In addition:Lost warning messages"
>
> Do you know what is the cause here? It seems related to memory allocation,
> or something under the hood relating to the interaction of R-Studio and data
> table.
>
> Zach
>
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