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.
