[R] mixed formatting of integer and numeric (e. g., by summary.default())

[Prof Brian Ripley]

On 05/04/2013 16:46, Gerrit Eichner wrote:
> Hello, eveRybody,
>
> I've been trying to find the origin for the following
> formatting-"inconsistency":
>
> E. g., look at the number of digits in summary.defaults()'s output when
> NAs occur: in my example below the number of NA's is displayed as an
> integer, the rest as numeric (floating point numbers):
>
>> summary.default( c( 1:2, NA))
>     Min. 1st Qu.  Median    Mean 3rd Qu.    Max.    NA's
>     1.00    1.25    1.50    1.50    1.75    2.00       1
>
>
> However, if I define my own summary function using - from my current
> point of view - the same commands as the respective part of
> summary.default() does, i. e.,
>
>> my.summary <- function( object,
>                            digits = max( 3, getOption("digits")) - 3) {
>    nas <- is.na( object)
>    object <- object[ !nas]
>    qq <- stats::quantile( object)
>    qq <- signif( c( qq[ 1L:3L], mean( object), qq[ 4L:5L]),
>                  digits = digits)
>    names( qq) <- c( "Min.", "1st Qu.", "Median", "Mean", "3rd Qu.",
>                     "Max.")
>    v <- if( any( nas)) c( qq, NAs = sum( nas)) else qq
>    class( v) <- c("summaryDefault", "table")
>    v
>    }
>
>
> I get the following (look at the number of NA's):
>
>> my.summary( c( 1:2, NA))
>     Min. 1st Qu.  Median    Mean 3rd Qu.    Max.     NAs
>     1.00    1.25    1.50    1.50    1.75    2.00    1.00
>
>
> Could somebody please point me to what I'm overlooking?

The print() method for summary.default, and look carefully at the names.

>
>   Thanks & best regards  --  Gerrit
>
> PS:
>> sessionInfo()
> R version 2.15.2 (2012-10-26)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
>
> locale:
> [1] LC_COLLATE=German_Germany.1252  LC_CTYPE=German_Germany.1252
> [3] LC_MONETARY=German_Germany.1252 LC_NUMERIC=C
> [5] LC_TIME=German_Germany.1252
>
> attached base packages:
> [1] grDevices datasets  splines   graphics  stats     tcltk
> utils     methods
> [9] base
>
> other attached packages:
> [1] xtable_1.7-0     lattice_0.20-10  fortunes_1.5-0   svSocket_0.9-53
> [5] TinnR_1.0-5      R2HTML_2.2       Hmisc_3.10-1     survival_2.36-14
>
> loaded via a namespace (and not attached):
> [1] cluster_1.14.3 grid_2.15.2    svMisc_0.9-65  tools_2.15.2
>
> ---------------------------------------------------------------------
> Dr. Gerrit Eichner                   Mathematical Institute, Room 212
> gerrit.eichner at math.uni-giessen.de   Justus-Liebig-University Giessen
> Tel: +49-(0)641-99-32104          Arndtstr. 2, 35392 Giessen, Germany
> Fax: +49-(0)641-99-32109        http://www.uni-giessen.de/cms/eichner
>
> ______________________________________________
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595