R 3.5.1 on Windows 7
The documentation for 'var' says: "These functions return 'NA' when there is
only one observation (whereas S-PLUS has been returning 'NaN'), and fail if
'x' has length zero." The function 'sd' (based on 'var') has similar
documentation.
However, I get:
var(numeric(0))
[1] NA
rather than an error.
Personally I prefer that basic summary functions like 'var' not throw errors
even in corner cases. But either way, the result and the docs are
inconsistent.
Richard Raubertas
> sessionInfo()
R version 3.5.1 (2018-07-02)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
Matrix products: default
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.5.1 tools_3.5.1
>
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