Hi Isn't it due to rounding and floating point precision of different OSses?
Cheers Petr On 10 Feb 2005 at 3:44, Chang-Heok Soh wrote: > Hello, > I ran my simulations on the Unix verson of R1.9.1 and the Windows > version of R2.0.1 on XP. I kept getting different values for the mean > of the same column of the same matrix, and am perplexed. I would > appreciate if anyone could help explain the difference? > > Here is a sample code: > > set.seed(7293) > z1v <- rnorm(1000, mean=68, sd=13) > z1v <- (z1v-mean(z1v))/sd(z1v) > > Using R1.9.1 on Unix, I get: > > mean(z1v) > [1] -4.88775e-15 > > Using R2.0.1 on Windows XP, I get: > > mean(z1v) > [1] -3.7497e-16 > > The same problem occurs when I dump the data from one version and then > source it using the other version. > > Thanks for the help. > > Regards, > Chang-Heok > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html Petr Pikal [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html