[Rd] [linux] connection never times out

[jeroen00ms]

According to the download.file manual the timeout of a connection can be set
using options(timeout=10). This seems to work as expected on windows, but on
linux the connection does not timeout. I reproduced the problem both 0on
R-2.13 on Ubuntu and on R-2.12.1 on CentOS, but not in Windows.

> options(timeout=5)
> download.file("http://123.123.123.123/bla";, dest=tempfile())

I am running Ubuntu 11.04 with the R binaries from CRAN:

> sessionInfo()
R version 2.13.0 (2011-04-13)
Platform: i686-pc-linux-gnu (32-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8   LC_NUMERIC=C  
 [3] LC_TIME=en_US.UTF-8LC_COLLATE=en_US.UTF-8
 [5] LC_MONETARY=C  LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8   LC_NAME=C 
 [9] LC_ADDRESS=C   LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C   

attached base packages:
[1] stats graphics  grDevices utils datasets  methods   base 
> 

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[Rd] Randomness not due to seed

[jeroen00ms]

I am working on a reproducible computing platform for which I would like to
be able to _exactly_ reproduce an R object. However, I am experiencing
unexpected randomness in some calculations. I have a hard time finding out
exactly how it occurs. The code below illustrates the issue. 

mylm1 <- lm(dist~speed, data=cars);
mylm2 <- lm(dist~speed, data=cars);
identical(mylm1, mylm2); #TRUE

makelm <- function(){
return(lm(dist~speed, data=cars));
}

mylm1 <- makelm();
mylm2 <- makelm();
identical(mylm1, mylm2); #FALSE

When inspecting both objects there seem to be some rounding differences.
Setting a seed does not make a difference. Is there any way I can remove
this randomness and exactly reproduce the object every time?





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