Hi
Your HTML formatted message is scrambled so it is hard to understand what is
your problem. The probable cause is the fact that sum, mean and sd behave
differently when applied to different objects (vector, data.frame, ...)
Post in plain text together with at least result of
str(mtcars)
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of
> mokuram at sina.com
> Sent: Monday, November 14, 2016 4:01 AM
> To: r-help <r-help at r-project.org>
> Subject: [R] question on mean, sum
>
> Hi,
> I am working on functions such as sum(), mean() ...
> > sum(mtcars)[1] 13942.2> mean(mtcars)[1] NAWarning message:In
> mean.default(mtcars) : NA> sd(mtcars)Error in is.data.frame(x) :
()'double'
> why got different reply?Is this a BUG for the current version of R?my
version
> info:version.string R version 3.3.1 (2016-06-21)
>
> Thank you very much for the help.
> mokuram
>
> [[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.
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