[R-sig-ins] Hacking on the ChainLadder package?

[Ben]

Thank you very much Romain, these commands work.  I thought R (being
an interpreted language, and no part of this package needs
compilation) might have a short-cut to reload a module without
installing, but it really doesn't matter because the build/install
process runs in a few seconds on my computer anyway.

I can also source individual files as you mentioned.  Although if I
understand correctly, I need to be careful with that because the
sourced files will affect the bindings in a different namespace than
the original package.  Hmm, to continue with this thought, I guess I
could just write a file that sources all the files in the package;
that way I think I could just source the file I changed and the other
files, because they were installed in the default namespace, would
read the changed file.


Thanks again,

-- 
Ben Escoto

----------------- Original message -----------------
From: Romain Francois <romain.francois at dbmail.com>
To: Ben <misc7 at emerose.org>
Date: Wed, 21 Oct 2009 08:14:52 +0200
On 10/21/2009 05:40 AM, Ben wrote:
>
> Hi all,
>
> I'm new to R but would like to work on (and hopefully contribute
> usefully to) Markus Gesmann's excellent ChainLadder package.  However,
> I don't have a development loop in place, so I'd appreciate some
> guidance on how best to work on this.  I have the actual package
> installed in
>
>      ~/R/x86_64-pc-linux-gnu-library/2.8/ChainLadder
>
> and I have the code checked out from subversion in:
>
>      ~/prog/chainladder-read-only

Hi,

what you checked out is the source of the package, this is really 
different from the compiled package you'll find in 
/R/x86_64-pc-linux-gnu-library/2.8/ChainLadder which is the kind of 
structure "library" expects.

The best way is to recompile the package after your change, i.e.

cd prog
R CMD build chainladder-read-only
R CMD INSTALL ChainLadder*.tar.gz 
--library=~/R/x86_64-pc-linux-gnu-library/2.8


But you can also just source the file you modified, something like :

R> chainladder.dir <- "~/prog/chainladder-read-only/R"
R> source( file.path( chainladder.dir, "Triangles.R" ) )

Romain

> I'd like some way of editing the files,
> e.g. ~/prog/chainladder-read-only/R/Triangles.R and testing it without
> having to make a whole new package and install it.  However, I can't
> seem to load the package from my subversion directory:
>
>      >  library(ChainLadder, lib="~/prog")
>      Error in library(ChainLadder, lib = "~/prog/chainladder-read-only") :
>        there is no package called 'ChainLadder'
>
> if I make the symbolic link "ChainLadder" to "chainladder-read-only" I
> get:
>
>      >  library(ChainLadder, lib="~/prog")
>      Error in library(ChainLadder, lib = "~/prog") :
>        'ChainLadder' is not a valid package -- installed<  2.0.0?
>
> which I don't know what it means and google isn't super-helpful.  I'm
> also not even sure I'm on the right track.
>
> So anyway, I'd really appreciate it if Markus or another ChainLadder
> or R guru has some tips on how best to use subversion and R.  If it
> matters, I'm using emacs/ESS as my editor.
>
> Thank you very much,
>


-- 
Romain Francois
Professional R Enthusiast
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http://romainfrancois.blog.free.fr
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