On 10/27/2009 8:15 AM, Kenneth Roy Cabrera Torres wrote:
Hi R developers:
Congratulations for the new R 2.10.0 version.
It is a huge effort! Thank you for your work and dedication.
I just want to ask how to make this "strip blank" function
to work again (it works on R.2.9.2).
alumnos$AL_NUME_ID<-sub("(^ +)|( +$)","",alumnos$AL_NUME_ID),)
"alumnos" is a data base with 900.000 rows and 72 columns.
and "alumnos$AL_NUME_ID" is a character variable read form
a "mysql" database.
The system shows me this message:
Error: C produce desborde de pila en 'segfault'
It seems a "stack overflow" problem, but it works on R 2.9.2!
Thank you for your help, and again, thank you for your work!!!
I just tried that (after fixing the typo at the end of the line) and it
worked on these vectors:
x <- c("a", " a", "a ", " a ")
y <- rep(x, 900000)
So there is something about your dataset that is causing the problem.
Can you narrow it down? Here are some tests:
1. Check that it is the value that is causing the problem, not the
manner of getting it:
x <- alumnos$AL_NUME_ID
y <- sub("(^ +)|( +$)","",x)
2. See if it is in the first half of the data:
x <- alumnos$AL_NUME_ID
x <- x[seq_len(length(x)/2)]
y <- sub("(^ +)|( +$)","",x)
3. See if it is in the second half:
x <- alumnos$AL_NUME_ID
x <- x[-seq_len(length(x)/2)]
y <- sub("(^ +)|( +$)","",x)
If you can narrow it down to a particularly short vector that causes the
error, that would be very helpful. It's likely to be somewhat tedious,
because I imagine those segfaults will terminate R; I'd suggest using
save.image() a lot when things are working, so you can restart after a
crash.
Duncan Murdoch
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