Re: [R] Re storing a UPDATES on a data.frame
Thank you Prof Brian, this really solved my problem and it was well explained
:)
Prof Brian Ripley wrote:
>
> Well
>
> - MASS is a package and not a library
> - it is not 'base' but 'contributed', and as library(help=MASS) says,
> support software for a book. It is on CRAN.
> - Packages with namespaces are read-only, so you have not changed the
> data frame in MASS, and even for other packages you can only change the
> copy in memory, not that on disc (all 'unless you know to subvert the
> standard ways').
>
> What you likely did was to create a new data frame 'whiteside' in your
> user workspace and then save the workspace containing it. In which case
>
> rm(whiteside)
> save.image()
>
> will fix it. However, you should have got warnings about conflicts when
> you started R, but perhaps you forgot to mention those.
>
> Perhaps the following might be educative:
>
>> library(MASS)
>> find("whiteside")
> [1] "package:MASS"
>> whiteside$temp <- 1
>> find("whiteside")
> [1] ".GlobalEnv" "package:MASS"
>
> This is really an internal version of
>
> whiteside <- `$<-`(whiteside, temp, 1)
>
> and that assigns in the current frame just like any other assignment.
>
>
> On Fri, 15 Feb 2008, savanna3000 wrote:
>
>>
>> Hello everyone,
>>
>> Can anyone tell me how do I restore data in a data.frame provided by
>> base
>> R libraries (MASS) ?
>> I uninstalled R then installed it again and I still see the new changes I
>> made!!!???
>> (eg. whiteside$Temp=1 ==> 1 overwrote all the rows, I want the old values
>> :(
>> !!
>>
>>
>> Please HELP!
>> --
>> View this message in context:
>> http://www.nabble.com/Restoring-a-UPDATES-on-a-data.frame-tp15512767p15512767.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> __
>> R-help@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
> --
> Brian D. Ripley, [EMAIL PROTECTED]
> 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 272866 (PA)
> Oxford OX1 3TG, UKFax: +44 1865 272595
>
> __
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
--
View this message in context:
http://www.nabble.com/Restoring-a-UPDATES-on-a-data.frame-tp15512767p15530584.html
Sent from the R help mailing list archive at Nabble.com.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Re: [R] Re storing a UPDATES on a data.frame
Well
- MASS is a package and not a library
- it is not 'base' but 'contributed', and as library(help=MASS) says,
support software for a book. It is on CRAN.
- Packages with namespaces are read-only, so you have not changed the
data frame in MASS, and even for other packages you can only change the
copy in memory, not that on disc (all 'unless you know to subvert the
standard ways').
What you likely did was to create a new data frame 'whiteside' in your
user workspace and then save the workspace containing it. In which case
rm(whiteside)
save.image()
will fix it. However, you should have got warnings about conflicts when
you started R, but perhaps you forgot to mention those.
Perhaps the following might be educative:
> library(MASS)
> find("whiteside")
[1] "package:MASS"
> whiteside$temp <- 1
> find("whiteside")
[1] ".GlobalEnv" "package:MASS"
This is really an internal version of
whiteside <- `$<-`(whiteside, temp, 1)
and that assigns in the current frame just like any other assignment.
On Fri, 15 Feb 2008, savanna3000 wrote:
>
> Hello everyone,
>
> Can anyone tell me how do I restore data in a data.frame provided by base
> R libraries (MASS) ?
> I uninstalled R then installed it again and I still see the new changes I
> made!!!???
> (eg. whiteside$Temp=1 ==> 1 overwrote all the rows, I want the old values :(
> !!
>
>
> Please HELP!
> --
> View this message in context:
> http://www.nabble.com/Restoring-a-UPDATES-on-a-data.frame-tp15512767p15512767.html
> Sent from the R help mailing list archive at Nabble.com.
>
> __
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Brian D. Ripley, [EMAIL PROTECTED]
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 272866 (PA)
Oxford OX1 3TG, UKFax: +44 1865 272595
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[R] Re storing a UPDATES on a data.frame
Hello everyone, Can anyone tell me how do I restore data in a data.frame provided by base R libraries (MASS) ? I uninstalled R then installed it again and I still see the new changes I made!!!??? (eg. whiteside$Temp=1 ==> 1 overwrote all the rows, I want the old values :( !! Please HELP! -- View this message in context: http://www.nabble.com/Restoring-a-UPDATES-on-a-data.frame-tp15512767p15512767.html Sent from the R help mailing list archive at Nabble.com. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
