Dear all, I have released a new package called ncArray for manipulating netcdf files. It depends on the functions ncread, ncwrite and ncinfo from octcdf. Maybe someday, these functions will be implemented in octave (as they are in matlab) and ncArray will be independent from octcdf.
The package allows to access a single or a collection of NetCDF files (or OPeNDAP URLs) as a multi-dimensional array. For a collection of NetCDF files, the variables are concatenated along a given dimension similar to the command cat. The ncArray object contains only a reference to the underlying files. The data is loaded only, if the array is indexed. For example, if the current directory containts file1.nc, file2.nc and file3.nc and each file contains the 20 x 30 variable temp, then: A = ncCatArray(3,'file*.nc','temp') would create and array A of size 20 x 30 x 3 without actually loading the files. Only when the array is index e.g., A(:,:,2:3), the file file2.nc and file3.nc are loaded. Also, reduction operators are implement. For example, sum(A,3) would compute the sum over the 3rd dimension and sequentially loading all files. ncArray allows thus to write code for dataset which are too big to be loaded in memory and still to write code that are independent on the way the data is stored and how a data set is split across files. More example how to use this package are available here: http://modb.oce.ulg.ac.be/mediawiki/index.php/NcArray Best rega ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Octave-dev mailing list Octave-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/octave-dev
