Hello,
You cannot change the numerical accuracy, it's a built-in constant. To
see it use
?.Machine
.Machine$double.eps # smallest value different from zero
Actually, .Machine$double.eps is the "the smallest positive
floating-point number x such that 1 + x != 1"
You can try the following function
is.zero <- function(x, eps = .Machine$double.eps^0.5) abs(x) < eps
is.zero(your_value) # TRUE?
Or even try ?all.equal
all.equal(your_value, 0)
Hope this helps,
Rui Barradas
Em 10-04-2013 22:13, nntx escreveu:
Rui, thanks for your reply. You meant that it is the issue of accuracy? So if
I change the numerical accuracy, my results can be output? Thanks a lot!
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