Note from `B Ripley': you need libraries for a specific compiler on Windows.
Professor Ripley.
On Tue, 26 Apr 2005, Russell Moffitt wrote:
Aloha,
I just made some quick hacks on the configure script with the 'ncdf' package to make it link with the opendap/dods libraries (opendap.org) rather than the netcdf api library. Basically, this allows a user to interact in R with a remotely served dataset as if it were a netcdf file on the local filesystem (read-only). Functionality with local files should continue to work as well. This opendap feature should be greatly useful for a number of fields of scientific computing, including oceanography and climate modelling, where a huge number of data sets are already served via opendap around the world.
In order to do this, the user must install the opendap/dods netcdf libraries on the system and then run
R CMD INSTALL --configure-args="-with-dods=$DODS_INSTALL_DIR" ncdf_1.3-dods.tar.gz
where $DODS_INSTALL_DIR is wherever the opendap lib and include directories are found.
My modifications are small and unelegant, but it works, providing that the user can successfully install the opendap libraries. I am neither a compile guru nor do I have very much experience using and developing for R. Therefore, I would like to see if anyone would be willing to help me make this modification into a more official package/patch that can be shared with other R users. The biggest obstacle for me is making binaries for Windows. Precompiled opendap libraries are available for windows, so this should be possible. B Ripley has compiled the 'ncdf' package for windows, and this version should be exactly the same except for different external libraries.
This same modification should also be possible for the RNetCDF/nvar packages since they use the same support libraries. I just happened to try it with ncdf first. Which package do more people tend to use/like for accessing netcdf files?
Please let me know if you can provide some assistance in making this modified package as easy to install as possible on unix/linux/windows/etc... I can provide more info about the opendap library and what is required to link to it if you ask.
Mahalo, Russell
P.S. I imagine that this opendap support in R will allow us to list R on opendap.org's list of client applications, giving R some more exposure.
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-- 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, UK Fax: +44 1865 272595
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