Invalid file identifier in matlab

Question

I\'m trying to read a text file using textscan(fID,format). However, I get an error telling me Invalid file identifier. Use fopen to generate a valid file ide

Answer 1

If fopen cannot open the file, then fID is -1.

Possible Causes :

• Wrong File Path.
• Corrupt File.
• File doesn't exist
• File already in use.