R help - Apr 2007 - summary and min max

Hi,

I came across a case where there's a discrepancy between minimum and
maximum values reported by 'summary' and the 'min' and
'max' functions:

---<---------------cut here---------------start-------------->---
R> str(tt)
 num [1:1397] 1952 1970 1976 1967 1946 ...
R> summary(tt)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
   1920    1960    1970    1970    1980    2000 
R> min(tt)
[1] 1918
R> max(tt)
[1] 2001
R> sessionInfo()
R version 2.5.0 beta (2007-04-12 r41139) 
x86_64-pc-linux-gnu 

locale:
LC_CTYPE=en_CA.UTF-8;LC_NUMERIC=C;LC_TIME=en_CA.UTF-8;LC_COLLATE=en_CA.UTF-8;LC_MONETARY=en_CA.UTF-8;LC_MESSAGES=en_CA.UTF-8;LC_PAPER=en_CA.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_CA.UTF-8;LC_IDENTIFICATION=C

attached base packages:
[1] "stats"     "graphics"  "grDevices"
"utils"     "datasets"  "methods"
[7] "base"     

other attached packages:
lattice 
"0.14-17" 
---<---------------cut here---------------end---------------->---

So this is a simple numeric vector, without any NA's, so I'm not sure
what's causing the discrepancy between these functions.  Any suggestions
as to what to look for welcome.  Thanks.


Cheers,

-- 
Seb

Sebastian P. Luque <spluque <at> gmail.com> writes:
> 
> Hi,
> 
> I came across a case where there's a discrepancy between minimum and
> maximum values reported by 'summary' and the 'min' and
'max' functions:
> 
>
  By default summary only lists 3 significant digits ...
see ?summary

  Ben Bolker

  (is this a candidate for a FAQ?)

"Sebastian P. Luque" <spluque at gmail.com> wrote:
> I came across a case where there's a discrepancy between minimum and
> maximum values reported by 'summary' and the 'min' and
'max' functions:
summary() rounds by default. Thus its reporting oddball values
is considered a feature, not a bug.

-- 
Mike Prager, NOAA, Beaufort, NC
* Opinions expressed are personal and not represented otherwise.
* Any use of tradenames does not constitute a NOAA endorsement.