On 12-05-05 10:39 PM, Joshua Ulrich wrote:
Hi all,
I experienced a crash in R-2.15.0 on 32-bit Windows XP (sessionInfo
below) when running the piece of code below. I cannot replicate the
error on 64-bit Linux, 64-bit Windows, or 32-bit R running under
64-bit Windows. I do not have, and could not find, a 32-bit version
of Linux to test this.
NOW<- Sys.time()
FUTURE<- NOW+1:1e7
crash<- as.character(FUTURE)
Error in unlist(unclass(x)[1L:3L]) :
promise already under evaluation: recursive default argument
reference or earlier problems?
traceback()
Error: C stack usage is too close to the limit
# evaluating an expression at this point would cause R to exit ungracefully
I think what's happening is this:
R tries to allocate one of those names, and fails.
It tries to display an error message, but that fails too, because it
needs memory for the message.
You get a strange error, and R is left unstable.
In R-devel, R appears to go into an infinite loop.
I'm not sure we'll fix R 2.15.x unless it's a relatively easy fix, but
I'll try to get R-devel to at least report an error.
Duncan Murdoch
Here's an example that avoids a lot of unnecessary code:
L1<- list(one=1:1e6, two=1:1e6, three=1:1e6)
# no issue with smaller list elements
U1<- unlist(L1, recursive=TRUE, use.names=TRUE)
C1<- c(L1, recursive=TRUE, use.names=TRUE)
L2<- list(one=1:1e7, two=1:1e7, three=1:1e7)
# crashes after ~2min with error above
U2<- unlist(L2, recursive=TRUE, use.names=TRUE)
C2<- c(L2, recursive=TRUE, use.names=TRUE)
# no issue if use.names=FALSE
U3<- unlist(L2, recursive=TRUE, use.names=FALSE)
C3<- c(L2, recursive=TRUE, use.names=FALSE)
I took a look at do_unlist and do_c_dflt in bind.c, but I stopped at
NewExtractNames because it is a bit beyond my current understanding.
Any thoughts?
sessionInfo()
R version 2.15.0 (2012-03-30)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
Please let me know if I forgot anything or if there's anything I can do to help.
Best,
--
Joshua Ulrich | FOSS Trading: www.fosstrading.com
R/Finance 2012: Applied Finance with R
www.RinFinance.com
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