Error using textscan Invalid file identifier. Use fopen to generate a valid file identifier.

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Ashkan Shahsavan 2020-7-15

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https://ww2.mathworks.cn/matlabcentral/answers/565610-error-using-textscan-invalid-file-identifier-use-fopen-to-generate-a-valid-file-identifier

评论： dpb 2020-7-16

I'm doing a simulation using MATLAB. There is a python code that reads the plain-text files for model setup and generates text files easy to import by Matlab. The program makes plain-text files containing number of values and a column of values. However, when I run the program in MATLAB the following error occurs:

Error using textscan
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in load_setup>load_word (line 247)
    temp=textscan(fid,'%d'); % eat up default '1'
Error in load_setup (line 59)
Model.code=load_word(standard_folder_name,'Model_code');
Error in Simulate (line 57)
[conditions, modes, Model]=load_setup(setup_name, model_name);

I don't know exactly what to do.

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Ashkan Shahsavan 2020-7-16

I'm sure about the presence of the file in the working directory since when I change the working directory, the error is changed to file not found. And what do you mean by fully-qualified filename? Thanks for your answer.

dpb 2020-7-16

"what do you mean by fully-qualified filename?"

One that includes the path, not just the file name.

Well, we can't tell from here what the script is doing -- since it didn't test for valid fid on fopen but just let the system error message report, you don't know anything else, specifically.

Set a breakpoint in the script/function and see what gives -- you can add the optional error message return to fhe fopen call and see what the actual error returned was...

Or, if it's a script, maybe they presumed you had already opened the file yourself first??? We simply can't tell.

Also, of course, make sure you're actually running the script (or the script/function itself is running in the location you think--maybe it tries to be clever and does a cd inside to where it thinks the input files should be...

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