Error in reading variables in netcdf files

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Joydeb Saha
Joydeb Saha 2024-3-7
回答： Walter Roberson 2024-3-7
javaaddpath('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\netcdfAll-4.2.jar');
javaaddpath('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\snctools\classes');
addpath ('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\snctools');
addpath ('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\mexnc');
addpath ('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\netcdf_toolbox')
addpath ('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\netcdf_toolbox\netcdf\ncsource')
addpath('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\netcdf_toolbox\netcdf\nctype')
addpath('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\netcdf_toolbox\netcdf\ncutility')
addpath('D:\SHUM\NetCDF file read\netcdf souceforge\mexcdf\netcdf_toolbox\netcdf')
myFolder ='E:\ERA5\U\U_Clim_1987_2016\U_06';
filePattern = fullfile(myFolder, '*.nc');
Files = dir(filePattern);
% for k= 1:length(Files)
k=1;
baseFileName = Files(k).name;
fullFileName = fullfile(myFolder, baseFileName);
fprintf(1, 'Now reading %s\n', fullFileName);
data_specific=netcdf.open(fullFileName);
ncid = netcdf.open(fullFileName,'NC_NOWRITE');
varid_spe = netcdf.inqVarID(ncid,'u10');
scale_factor_spe = netcdf.getAtt(ncid,varid_spe,'scale_factor');
add_ofset_spe=netcdf.getAtt(ncid,varid_spe,'add_offset');
fill_value_spe=netcdf.getAtt(ncid,varid_spe,'_FillValue');
unit=netcdf.getAtt(ncid,varid_spe,'units');
long_name=netcdf.getAtt(ncid,varid_spe,'long_name');
lat=data_specific{'latitude'}(:);
lon1=data_specific{'longitude'}(:);
time=data_specific{'time'}(:);
>> lat=data_specific{'latitude'}(:);
Brace indexing is not supported for variables of this type. I found this type of error

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采纳的回答

Walter Roberson
Walter Roberson 2024-3-7
data_specific=netcdf.open(fullFileName);
%...
lat=data_specific{'latitude'}(:);
data_specific will be an ncid (netcdf identifier -- an integer)
There is no documented syntax for using {} indexing of an ncid.
You have to use things such as netcdf.getvar()

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