R help - Jul 2008 - Howto view function's source code of an installed package

Hi,

Is there a way I can view the functions source code of  a
package I installed in my PC.

For example I downloaded the great "mixtools" package.
I want to see the source code of one of its function "normalmixEM"

Is there a way to do it? Presumably from R command prompt?

I tried to take a look at the zip file, but somehow I can't seem
to find the file on which I can find the source code. Please advice.

- Gundala Viswanath
Jakarta - Indonesia

Gundala Viswanath wrote:
> Hi,
>
> Is there a way I can view the functions source code of  a
> package I installed in my PC.
>
> For example I downloaded the great "mixtools" package.
> I want to see the source code of one of its function
"normalmixEM"
>
> Is there a way to do it? Presumably from R command prompt?
>
> I tried to take a look at the zip file, but somehow I can't seem
> to find the file on which I can find the source code. Please advice.
>
> - Gundala Viswanath
> Jakarta - Indonesia
>
> ______________________________________________
> R-help at 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.
>   
Hi,

You can see the R-source code of a function if you give the command 
without the brackets. For example:

 > sort
function (x, decreasing = FALSE, ...)
{
    if (!is.logical(decreasing) || length(decreasing) != 1)
        stop("'decreasing' must be a length-1 logical vector.\nDid
you
intend to set 'partial'?")
    UseMethod("sort")
}
<environment: namespace:base>

Another option is to download the .tar.gz source package from CRAN, 
unpack it and the R source code is available in the "R" subdirectory.

cheers,
Paul

-- 
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: 	+31302535773
Fax:	+31302531145
http://intamap.geo.uu.nl/~paul

I justed wanted to provide a description of how I was able to view source
code of a function.

First download the Program R package containing the function.  Specifically,
download the file that ends in "tar.gz".  This is a compressed file. 
Expand
the compressed file using, for example, "WinZip".  Next open the
uncompressed file that ends in ".tar".  I was able to open that file
with
the free software "7-Zip" available on the internet.  After installing
that
software I clicked on the file "7zFM.exe" and navigated to the
directory
containing the ".tar" file.  You can extract the contents of that
".tar"
file into a new folder.  The contents consist of R files showing the source
code for the functions in the R package.  These R files can be opened with a
text editor.

Hopefully, it is okay to mention other software here by name.  I have used
the above method twice in the last few months to view source code for
functions.  In both instances I needed a substantial amount of time to
figure out how to do it.  This post might help others and perhaps will help
myself in the future.

Mark W. Miller

Gainesville, Florida


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