Message-ID: <4A19AFBD.5060304@stats.uwo.ca>
Date: 2009-05-24T20:36:13Z
From: Duncan Murdoch
Subject: Getting an older version of a package
In-Reply-To: <5562ab3b0905241300v58c66057w43d8bd2d82b7c9f6@mail.gmail.com>
On 24/05/2009 4:00 PM, Le Wang wrote:
> Hi there,
>
> Thanks for your time in advance.
>
> I am using an add-on package from Cran. After I updated this package,
> some of my programs don't work any more. I was wondering if there is
> anything like version control so that I could use the older version of
> that package; or if I could manually install the previous version and
> how I could acheive it? I am not a regular R user; although it is
> supposed to be very easy, after spending many hours on this, I still
> haven't figured out how to proceed. Your help will be greatly
> appreciated.
CRAN has the older versions of the package available in source form.
You need to download one of those and install it: but watch out for
other packages that depend on the newer one. In the long run, it's
probably a better investment of your time to fix your programs to work
with the new package. (Or possibly report to the package maintainer if
they have introduced a bug.)
Prior to R 2.9.0, it was possible to install multiple different versions
of packages, but this never worked perfectly, and it has been dropped.
Duncan Murdoch