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How to report a segmentation fault

4 messages · Sean Davis, Ben Madin, Daniel Serodio (lists)

Original
Daniel Serodio (lists)
# 
I'm a complete R newbie. My first R script is to generate a histogram 
from a CSV file, and I'm getting a segmentation fault every time.

 > csv <- read.csv(file='data.csv',head=TRUE,sep=",")
 > hist(csv$foo)

  *** caught segfault ***
address 0x0, cause 'memory not mapped'

Traceback:
  1: title(main = main, sub = sub, xlab = xlab, ylab = ylab, ...)
  2: plot.histogram(r, freq = freq1, col = col, border = border, angle = 
angle,     density = density, main = main, xlim = xlim, ylim = ylim,     
xlab = xlab, ylab = ylab, axes = axes, labels = labels, ...)
  3: plot(r, freq = freq1, col = col, border = border, angle = 
angle,     density = density, main = main, xlim = xlim, ylim = ylim,     
xlab = xlab, ylab = ylab, axes = axes, labels = labels, ...)
  4: hist.default(csv$last_web_mail_date)
  5: hist(csv$last_web_mail_date)




How should I report this bug? I'm running R 2.14.0 (compiled by "brew") 
on Lion

Thanks in advance,
Daniel Serodio
Ben Madin
# 
Daniel,

I can't help much with the segfault, but if you want someone to help you need to provide a minimum reproducible example. In this case you have the code, but not the data - leaving me wondering :

is this dataset so huge that most computers would run out of capacity?
does it happen with a subset of the data? (even just a few rows... one row?)
does it happen with a hist of anything - what does hist(rnorm(1e4)) give you ?
is there a column called foo in the file?
is there an out of range value in the csv file?

I would suggest you supply the data (or at least as much as is required to reproduce the error), and also the output of sessionInfo()

As a R newbie, you might also want to have a look at :

http://www.r-project.org/posting-guide.html
http://www.catb.org/~esr/faqs/smart-questions.html

I hope someone can help you more than I!

cheers

Ben
On 07/12/2011, at 9:34 PM, Daniel Serodio (lists) wrote: