[Rd] Randomness not due to seed

From: jeroen00ms <jeroen.ooms_at_stat.ucla.edu>
Date: Tue, 19 Jul 2011 06:13:01 -0700 (PDT)


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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Received on Tue 19 Jul 2011 - 21:59:47 GMT

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