R devel - Aug 2000 - data editor freeze on empty data frame (PR#622)

It is quite tempting to start simple data entry sessions where
you need to type in the data like this:

my.frame<-data.frame(a=numeric(0),b=numeric(0))
fix(my.frame)

(and if factors are involved, that is pretty much what you'd have to do
in order to get the appropriate levels)

However, in the X version, this seems to cause the data editor to
freeze as soon as one hits Enter after inserting data into the
first cell. I haven't tried the Windows version yet.

[This is something it would be nice to have resolved in 1.1.1]

--please do not edit the information below--

Version:
 platform = i586-pc-linux-gnu
 arch = i586
 os = linux-gnu
 system = i586, linux-gnu
 status = Patched
 major = 1
 minor = 1.0
 year = 2000
 month = August
 day = 1
 language = R

Search Path:
 .GlobalEnv, Autoloads, package:base

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pd@blueberry.kubism.ku.dk writes:
> However, in the X version, this seems to cause the data editor to
> freeze as soon as one hits Enter after inserting data into the
> first cell. I haven't tried the Windows version yet.
Freezes the windows version as well, it seems. Also, the code for
editing factors using their numeric codes seems to have been broken in
1.1.0 (only converts back to factor if there are invalid levels). I'll
fix the latter.

[I'm also not happy with the code that autoinserts mistyped or
otherwise extraneous factor levels -- if they really are typos,
they'll be a pain to remove if one used fix(my.frame)! That
may be against policy to change in a patch release, though...]

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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> To: r-devel@stat.math.ethz.ch
> Cc: R-bugs@biostat.ku.dk
> Subject: Re: [Rd] data editor freeze on empty data frame (PR#622)
> From: Peter Dalgaard BSA <p.dalgaard@biostat.ku.dk>
> Date: 02 Aug 2000 14:35:42 +0200
> 
> pd@blueberry.kubism.ku.dk writes:
> 
> > However, in the X version, this seems to cause the data editor to
> > freeze as soon as one hits Enter after inserting data into the
> > first cell. I haven't tried the Windows version yet.
> 
> Freezes the windows version as well, it seems. Also, the code for
> editing factors using their numeric codes seems to have been broken in
> 1.1.0 (only converts back to factor if there are invalid levels). I'll
> fix the latter.
Found and corrected: an infinite loop in getccol when the length
was zero, of very long standing.
> [I'm also not happy with the code that autoinserts mistyped or
> otherwise extraneous factor levels -- if they really are typos,
> they'll be a pain to remove if one used fix(my.frame)! That
> may be against policy to change in a patch release, though...]
Until the data editor has a mode for factors, the current compromise,
to edit as character, seems the best one to me.  Using cut and paste
helps to eliminate typos.

-- 
Brian D. Ripley,                  ripley@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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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