On 31 Dec 2013, at 17:32 , Duncan Murdoch <murdoch.dun...@gmail.com> wrote:
> On 13-12-31 9:48 AM, David Parkhurst wrote:
>> Two or three respondents asked for an example of my problem. Here's
>> what's happening to me now. I can't reproduce how I got to this point,
>> though:
>>
>> > ls()
>> [1] "All8" "All8Sites" "A" "B" "C" "i" "n" "D" "F"
>> > X
>> Error: object 'X' not found
>> > attach(All8Sites)
>> > ls()
>> [1] "All8" "All8Sites" "A" "B" "C" "i" "n" "D" "F"
>>
>>
>> "X" is one of the variables in the data frame I attached in the third
>> command above, but it's not listed by >ls(). If I enter > X now, its
>> values ARE listed, but it's hiding somewhere. What is happening here?
>> How can I get the variables in that data frame listed when I attach it?
>
> Use search() to see the search list. Your dataframe will likely be in
> position 2. Use ls(2) to see the variables there.
Or ls("All8Sites"). Notice, by the way, that this is subtly but importantly
different from ls(All8Sites). E.g.,
> attach(airquality)
> ls(2)
[1] "Day" "Month" "Ozone" "Solar.R" "Temp" "Wind"
> ls(airquality)
[1] "Day" "Month" "Ozone" "Solar.R" "Temp" "Wind"
> search()
[1] ".GlobalEnv" "airquality" "package:stats"
[4] "package:graphics" "package:grDevices" "package:utils"
[7] "package:datasets" "package:methods" "Autoloads"
[10] "package:base"
> ls("airquality")
[1] "Day" "Month" "Ozone" "Solar.R" "Temp" "Wind"
> rm(Month, pos=2)
> ls(airquality)
[1] "Day" "Month" "Ozone" "Solar.R" "Temp" "Wind"
> ls("airquality")
[1] "Day" "Ozone" "Solar.R" "Temp" "Wind"
> detach()
> ls("airquality")
Error in as.environment(pos) :
no item called "airquality" on the search list
-pd
>
> Duncan Murdoch
>
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--
Peter Dalgaard, Professor
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd....@cbs.dk Priv: pda...@gmail.com
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