CODEWITHSUNDEEP
matlabnetcdf
0000011111
0000011111

Reputation: 133

test if netcdf file is valid without crashing

I am reading multiple netcdf files using the ncread function in matlab. For a reason unknown to me, some files (described by FILEPATH in the following) are not properly read and ncread crashes, producing the error message:

Error using internal.matlab.imagesci.nc/openToRead (line 1259) Could not open FILEPATH for reading.

Error in internal.matlab.imagesci.nc (line 121) this.openToRead();

Error in ncread (line 53) ncObj = internal.matlab.imagesci.nc(ncFile);

Error in MY_FUNCTION (line 102) Lon = nanmean(ncread(FILEPATH,'Lon'));

If you know of a method to test netcdf files without crashing, or if you understand what produces this error, any insight would be appreciated.

Upvotes: 0

Views: 1003

Answers (1)

user2271770
user2271770

Reputation:

The standard way is to wrap the possibly-failing statement in a try/catch statement to intercept the thrown exception before interrupting the function execution, like this:

function [out1, out2, ...] = MY_FUNCTION(arg1, arg2, ...)

        %//Initial code

        try
                Lon_data = ncread(FILEPATH,'Lon');
        catch ME
                warning('MY_FUNCTION:ncread', 'Could not load because <<%s>>',ME.message);
                %//Do something to recover from error
                %//Return from function if recover not possible
        end;
        Lon = nanmean(Lon_data);

        %//Rest of the code

end

Please note that ... in the function signature above is not valid MATLAB syntax, but rather something that says "here are some inputs and outputs that I don't know how they are declared"; please substitute with your proper in/out declaration.

Upvotes: 1

Related Questions