Add tool to extract the NCEP year from the reanalysis file names

utilities/get_NCEP_year.m

+function year = get_NCEP_year(file)
+% Extract the year from a give NCEP file name (either 'uwnd.sig995.YYYY.nc'
+% or 'vwnd.sig995.YYYY.nc'). Files are those downloaded from
+% ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis/surface/.
+% 
+% INPUT:
+%   NCEP NetCDF filename (and path)
+% 
+% OUTPUT:
+%   NCEP data year
+% 
+% Author(s):
+%   Pierre Cazenave (Plymouth Marine Laboratory)
+% 
+% Revision history:
+%   2012-10-15 First version
+% 
+%==========================================================================
+
+[~, tmp_year, ~] = fileparts(file);
+tmp_year = regexp(tmp_year, '\.', 'split');
+year = str2double(tmp_year(end));
+if ~isnumeric(tmp_year)
+    error('Could not parse the NCEP year from the NCEP file name. Expecting ''uwnd.sig995.YYYY.nc'' or ''vwnd.sig995.YYYY.nc''')
+end