[Rd] names of return value of median

Vadim Organovich vogranovich at jumptrading.com
Wed Aug 20 19:30:38 CEST 2008

Dear R-devel,

The median() function assigns a name, "NA", to its return value if the return value is NA and the input vector has names, otherwise the names attribute is NULL. This looks strange and inconsistent with the behavior of mean().

This inconsistency becomes a problem when median() is used inside user code that relies on consistent naming convention.


> foo <- c(x=as.numeric(NA), y=as.numeric(NA), z=as.numeric(NA))
> names(mean(foo))
> names(median(foo))
[1] NA

## no names in input
> foo <- rep(as.numeric(NA), 3)
> names(median(foo))

> version
platform       i386-pc-mingw32
arch           i386
os             mingw32
system         i386, mingw32
major          2
minor          7.1
year           2008
month          06
day            23
svn rev        45970
language       R
version.string R version 2.7.1 (2008-06-23)

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