how are you checking invalid query in matlab

In MATLAB, you can use error handling techniques to check and handle invalid queries. This can be done using the try-catch block.

Here's an example that demonstrates how to check for and handle an invalid query in MATLAB:

main.m
try
    % Your code to execute
    % ...

    % Check for invalid query
    if (<condition to check if query is invalid>)
        error('Invalid query.');
    end

    % Code to execute when query is valid
    % ...

catch exception
    % Handle the exception
    disp(['Error: ' exception.message]);
end
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In the above code, you can replace <condition to check if query is invalid> with the specific condition that indicates an invalid query. If this condition is met, an error is thrown using the error function. In the catch block, you can handle and display the error message using exception.message.

Feel free to modify the code according to your specific requirement for checking an invalid query in MATLAB.