From p.dalgaard at biostat.ku.dk  Wed Mar 25 19:54:38 2009
From: p.dalgaard at biostat.ku.dk (Peter Dalgaard)
Date: Wed, 25 Mar 2009 19:54:38 +0100
Subject: [Rd] get_all_vars fails with matrices (PR#13624)
In-Reply-To: <20090325171010.619532834149@mail.pubhealth.ku.dk>
References: <20090325171010.619532834149@mail.pubhealth.ku.dk>
Message-ID: <49CA7DEE.50402@biostat.ku.dk>

s.wood at bath.ac.uk wrote:
> Hi,
> 
> According to the help file for model.frame/get_all_vars, the following should 
> produce the same output from both functions, but it doesn't...
> 
>> dat <- list(X=matrix(1:15,5,3),z=26:30)
>> model.frame(~z+X,dat)
>    z X.1 X.2 X.3
> 1 26   1   6  11
> 2 27   2   7  12
> 3 28   3   8  13
> 4 29   4   9  14
> 5 30   5  10  15
>> get_all_vars(~z+X,dat)
> [1] z    X    <NA> <NA>
> <0 rows> (or 0-length row.names)
>>                              
> -- the equivalent works ok if there are no matrices involved. 
> 
> I'm using  R version 2.9.0 alpha (2009-03-24 r48212) (Suse linux 10 and 11, 64 
> bit intel). I found the problem while trying to fix a problem in an mgcv 
> plotting routine.
> 
> best,
> Simon

This works, though:

 > dat <- data.frame(X=I(matrix(1:15,5,3)),z=26:30)
 > get_all_vars(~z+X,dat)
    z X.1 X.2 X.3
1 26   1   6  11
2 27   2   7  12
3 28   3   8  13
4 29   4   9  14
5 30   5  10  15

but there is something special with lists:

 > dat <- as.data.frame(list(X=I(matrix(1:15,5,3)),z=26:30))
 > get_all_vars(~z+X,dat)
    z X.1 X.2 X.3
1 26   1   6  11
2 27   2   7  12
3 28   3   8  13
4 29   4   9  14
5 30   5  10  15
 > dat <- data.frame(list(X=I(matrix(1:15,5,3)),z=26:30))
 > get_all_vars(~z+X,dat)
    z X.1 X.2 X.3
1 26   1   6  11
2 27   2   7  12
3 28   3   8  13
4 29   4   9  14
5 30   5  10  15
 > dat <- list(X=I(matrix(1:15,5,3)),z=26:30)
 > get_all_vars(~z+X,dat)
[1] z X
<0 rows> (or 0-length row.names)
 >


-- 
    O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
   c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
  (*) \(*) -- University of Copenhagen   Denmark      Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)              FAX: (+45) 35327907



[Rd] get_all_vars fails with matrices (PR#13624)
Peter Dalgaard