Hello,
You can see the code for jitter by typing its name at the prompt.
Inline.
Em 09-10-2014 18:19, Ingrid Charvet escreveu:
Hello,
A quick question relating to the documentation of the jitter function:
http://127.0.0.1:15714/library/base/html/jitter.html
jitter(x, factor = 1, amount = NULL)
"If amount is NULL (default), we set a <- factor * d/5 where d is the smallest
difference between adjacent unique (apart from fuzz) x values."
Therefore if length(x) = 1, then d = 0, which means jitter(x) should be equal
to x?
Which is not the case, i.e.
x <- 1
jitter(x)
[1] 0.9842914
So how does jitter deals with this situation? Does it assume d = x?
It doesn't assume, it computes range(x) and acts accordingly. The code
lines are
z <- diff(r <- range(x[is.finite(x)]))
if (z == 0)
z <- abs(r[1L])
It has the effect of setting z to x. Try running them. (And with x <- 2
to see the difference.)
Hope this helps,
Rui Barradas
Thanks
IC
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