[R-SIG-Mac] NA in table with integer types

[Don MacQueen]

?table tells you that the exclude argument tells it what to exclude. 
So of course, NA will not be shown in the output if you supply 
exclude=NA. exclude=NULL tells it to exclude nothing, hence NAs are 
shown.

This is not a Mac-specific question, by the way, so R-help would have 
been the place to ask.

-Don

At 2:11 PM -0500 4/7/05, Paul Rathouz wrote:
>Hi -- I am having the following problem with table() when applied to
>vectors of type (mode) integer.  When I use the table() command, I can
>only obtain an entry in the table for NA values by using exclude=NULL.
>Just issuing exclude=NA will not do it.  See below, where x is double at
>first, and then integer and notice the difference.  Is this a bug or is
>there something that I do not understand about the integer data type?
>Thanks -- pr
>
>------------------------------
>>  x <- c(1,2,3,3,NA)
>>  is.double(x)
>[1] TRUE
>>  table(x,exclude=NA)
>x
>1 2 3
>1 1 2
>>  table(x,exclude=NaN)
>x
>    1    2    3 <NA>
>    1    1    2    1
>>  table(x,exclude=NULL)
>x
>    1    2    3 <NA>
>    1    1    2    1
>>
>>  x <- as.integer(x)
>>  x
>[1]  1  2  3  3 NA
>>  is.na(x)
>[1] FALSE FALSE FALSE FALSE  TRUE
>>  is.integer(x)
>[1] TRUE
>>  table(x,exclude=NA)
>x
>1 2 3
>1 1 2
>>  table(x,exclude=NaN)
>x
>1 2 3
>1 1 2
>>  table(x,exclude=NULL)
>x
>    1    2    3 <NA>
>    1    1    2    1
>>
>>  R.version
>          _
>platform powerpc-apple-darwin6.8
>arch     powerpc
>os       darwin6.8
>system   powerpc, darwin6.8
>status
>major    2
>minor    0.1
>year     2004
>month    11
>day      15
>language R
>------------------------------
>
>==========================================================================
>Paul Rathouz, Assoc. Professor       ph   773-834-1970
>Dept. of Health Studies, Rm. W-264   fax  773-702-1979
>University of Chicago                prathouz at health.bsd.uchicago.edu
>5841 S. Maryland Ave. MC 2007
>Chicago, IL  60637
>
>_______________________________________________
>R-SIG-Mac mailing list
>R-SIG-Mac at stat.math.ethz.ch
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA