Hello,
while testing the crossprod() function under Linux, I noticed the following:
set.seed(883)
x <- rnorm(100)
x %*% x - sum(x^2) # equal to 1.421085e-14
Is this difference normal? It seems to be rather large for double precision.
Regards,
Alexis.
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I just realized that I was actually using a different random number
generator, could that be a valid reason for the discrepancy?
The code should be:
RNGkind("L'Ecuyer")
set.seed(883)
x <- rnorm(100)
x %*% x - sum(x^2) # equal to 1.421085e-14
Regards,
Alexis Sarda.
On Tue,
