Linux 2.9.0 gives:
> median(df1)
[1] 34
Ever stranger...
mario
Petr PIKAL wrote:
> During some experimentation in preparing R lessons I encountered this
> behaviour which I can not explain fully
>
> mat <- matrix(1:16, 4,4)
> df1 <- data.frame(mat)
>
>> mean(df1)
> X1 X2 X3 X4
> 2.5 6.5 10.5 14.5
>
> Expected, documented
>
>> median(df1)
> [1] 6.5 10.5
>
> Rather weird, AFAIK there shall not be an issue with data frame at least I
> did not find any in help page. I tracked it down probably to an As.Is
> operation with object and subsequent sorting in median.default.
>
> I know other (*apply) ways how to compute median for data frames so I just
> would like to hear an opinion about this behaviour from more experienced
> people.
>
> Thank you
> Best regards
>
> Petr
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
--
Ing. Mario Valle
Data Analysis and Visualization Group | http://www.cscs.ch/~mvalle
Swiss National Supercomputing Centre (CSCS) | Tel: +41 (91) 610.82.60
v. Cantonale Galleria 2, 6928 Manno, Switzerland | Fax: +41 (91) 610.82.82
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
