Le 17/02/2020 à 17:50, Tomas Kalibera a écrit :
On 2/17/20 5:36 PM, Serguei Sokol wrote:
Hi,
A colleague of mine has spotted me a passage of the doc ?option
talking about Inf and NaN check in 'matprod=default' section:
https://stat.ethz.ch/R-manual/R-devel/library/base/html/options.html
I am wondering if NA should be mentioned too as the check seems to
include this "value" too. NA being different from Inf and NaN it is
worth mentioning, isn't it?
Yes, NA is handled, too. NA is one of NaN values for the purpose of
this text
Thanks for clarification. It was not clear for me from the text itself.
(and it is also implemented that way, see ?NaN).
Indeed, the text of ?NaN says "... systems typically have
many different NaN values. One of these is used for the numeric
missing value ‘NA’, and ‘is.nan’ is false for that value."
However, R can return both NA and NaN symbols, e.g.
> mean(c(1, NA))
[1] NA
> mean(c(1, NaN))
[1] NaN
which does not help to understand their relationship. That's why I
continue to think that it would be clearer to mention NA explicitly in
option(matprod=default). It could be a phrasing like "... ensure correct
propagation of Inf and NaN (including NA) ..."
Best,
Serguei.
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