Thank you very much, I didn't know that.
On 08/06/2015 6:04 AM, Christian Brandstätter wrote:
Thank you for the explanation.
But if you take for instance plot.default(), being another generic
function, it would not work like that:
plot(1,2,3,4), only plot(1,2) is accepted.
From R-help (Usage):
## Default S3 method:
mean(x, trim = 0, na.rm = FALSE, ...)
What is puzzling, is that apparently na.rm (and trim, which is indicated in the
help) is accepting numeric values.
mean(c(1,NA,10),10,TRUE)
mean(c(1,NA,10),10,FALSE)
This should give at least a warning in my opinion.
It is a common idiom in R programming to treat non-zero values as TRUE,
and zero as FALSE. If every use of a number where a logical is needed
generated a warning, you'd be swamped with them.
Duncan Murdoch
mean(c(1,NA,10),10,200)
On 08/06/2015 09:27, Achim Zeileis wrote:
On Mon, 8 Jun 2015, Christian Brandst�tter wrote:
Dear list,
I found an odd behavior of the mean function; it is allowed to do
something that you probably shouldn't:
If you calculate mean() of a sequence of numbers (without declaring
them as vector), mean() then just computes mean() of the first
element. Is there a reason why there is no warning, like in sd for
example?
mean() - unlike sd() - is a generic function that has a '...' argument
that is passed on to its methods. The default method which is called
in your example also has a '...' argument (because the generic has it)
but doesn't use it.
Example code:
mean(1,2,3,4)
sd(1,2,3,4)
Best regards
Christian
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