[Rd] quantile and IQR do not check for numeric input (PR#13631)

[sgiannerini at gmail.com]

This report follows the post

http://tolstoy.newcastle.edu.au/R/e6/devel/09/03/0760.html

where it is shown that quantile() and IQR() do not work as documented.
In fact they do not check for numeric input even if the documentation says =
:

?quantile
x      numeric vectors whose sample quantiles are wanted. Missing
values are ignored.

?IQR

x 	a numeric vector.

> quantile(factor(1:9))
  0%  25%  50%  75% 100%
   1    3    5    7    9
Levels: 1 2 3 4 5 6 7 8 9

> IQR(factor(1:9))
[1] 4

> R.version
               _
platform       i386-pc-mingw32
arch           i386
os             mingw32
system         i386, mingw32
status         alpha
major          2
minor          9.0
year           2009
month          03
day            26
svn rev        48224
language       R
version.string R version 2.9.0 alpha (2009-03-26 r48224)

--
______________________________________________________

Simone Giannerini
Dipartimento di Scienze Statistiche "Paolo Fortunati"
Universita' di Bologna
Via delle belle arti 41 - 40126 =A0Bologna, =A0ITALY
Tel: +39 051 2098262 =A0Fax: +39 051 232153
http://www2.stat.unibo.it/giannerini/