R help - Sep 2007 - data.frame loses name when constructed with one column

Not sure why the data.frame function does not capture the name of the column
field when its being built with only one column.

Can anyone help?


> data
  out pred1 predd2
1   1   2.0    3.0
2   2   3.5    5.5
3   3   5.5   11.0
> data1=data.frame(data[,1])
> data1
  data...1.
1         1
2         2
3         3
> data1=data.frame(data[,1:2])
> data1
  out pred1
1   1   2.0
2   2   3.5
3   3   5.5
> sessionInfo()
R version 2.5.1 (2007-06-27) 
i386-pc-mingw32 

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] "stats"     "graphics"  "grDevices"
"utils"     "datasets"  "methods"
[7] "base"     
> 
	[[alternative HTML version deleted]]

Try drop=FALSE:
> x
  out pred1 predd2
1   1   2.0    3.0
2   2   3.5    5.5
3   3   5.5   11.0
> x[,1]
[1] 1 2 3
> data.frame(x[,1])
  x...1.
1      1
2      2
3      3
> data.frame(x[,1, drop=FALSE])
  out
1   1
2   2
3   3
>

On 9/4/07, Stan Hopkins <stanhopkins at comcast.net>
wrote:
> Not sure why the data.frame function does not capture the name of the
column field when its being built with only one column.
>
> Can anyone help?
>
>
>
> > data
>  out pred1 predd2
> 1   1   2.0    3.0
> 2   2   3.5    5.5
> 3   3   5.5   11.0
> > data1=data.frame(data[,1])
> > data1
>  data...1.
> 1         1
> 2         2
> 3         3
> > data1=data.frame(data[,1:2])
> > data1
>  out pred1
> 1   1   2.0
> 2   2   3.5
> 3   3   5.5
> > sessionInfo()
> R version 2.5.1 (2007-06-27)
> i386-pc-mingw32
>
> locale:
> LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
>
> attached base packages:
> [1] "stats"     "graphics"  "grDevices"
"utils"     "datasets"  "methods"
> [7] "base"
> >
>
>        [[alternative HTML version deleted]]
>
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>

-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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