Error using matlab.int​ernal.imag​esci.netcd​flib , R2021b

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Simon r
Simon r 2022-2-16
回答： Abhijeet 2024-1-22
I get an error using ncread
The script works on earlier release (R2020a)
What could be the reason for this?
---------------------
Error using matlab.internal.imagesci.netcdflib
The NetCDF library encountered an error during execution of 'open' function - 'I/O failure (NC_EIO)'. If the data source was an OPeNDAP URL, see the OPeNDAP Troubleshooting
section in the Users Guide.
Error in netcdf.open (line 67)
[varargout{:}] = matlab.internal.imagesci.netcdflib ( 'open', filename, varargin{1} );
Error in internal.matlab.imagesci.nc/openToRead (line 1280)
this.ncRootid = netcdf.open(this.Filename,'NOWRITE');
Error in internal.matlab.imagesci.nc (line 124)
this.openToRead();
Error in ncread (line 61)
ncObj = internal.matlab.imagesci.nc(ncFile);
Error in file (line 56)
lon = ncread(urlget,'longitude');
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回答（1 个）

Abhijeet
Abhijeet 2024-1-22
Hi Simon ,
I understand that you are facing isssue while using "ncread" function in MATLAB R2021b.
This is a known issue with the recent versions of the NetCDF library that is used by "ncread" function to query the OPeNDAP data. There has been a change in the implementation of this third-party library which is causing unintended errors in MATLAB and other programming languages that use this library.
To resolve this issue please refer either of the following workaround :-
1. Prepend the "ncread" source URL with “[fillmismatch]”
time=ncread("[fillmismatch]http://sccoos.org/thredds/dodsC/autoss/scripps_pier-2019.nc","time"");
2. Append the "ncread" source URL with “#fillmismatch”
time=ncread("http://sccoos.org/thredds/dodsC/autoss/scripps_pier-2019.nc#fillmismatch","time"");
I hope this resolves the issue you were facing.

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