[Rd] Randomness not due to seed
Jeroen Ooms
jeroen.ooms at stat.ucla.edu
Wed Jul 20 14:03:30 CEST 2011
>> I think Bill Dunlap's answer addressed it: the claim appears to be false.
Here is another example where there is randomness that is not due to
the seed. On the same machine, the same R binary, but through another
interface. First directly in the shell:
> sessionInfo()
R version 2.13.1 (2011-07-08)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_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
> set.seed(123)
> print(coef(lm(dist~speed, data=cars)),digits=22)
(Intercept) speed
-17.579094890510951643137 3.932408759124087715975
# And this is through eclipse (java)
> sessionInfo()
R version 2.13.1 (2011-07-08)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=en_US.UTF-8
[9] LC_ADDRESS=en_US.UTF-8 LC_TELEPHONE=en_US.UTF-8
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] rj_0.5.2-1
loaded via a namespace (and not attached):
[1] rJava_0.9-1 tools_2.13.1
> set.seed(123)
> print(coef(lm(dist~speed, data=cars)),digits=22)
(Intercept) speed
-17.57909489051087703615 3.93240875912408460735
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