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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 identifier. I used fopen to generate fID and got -1. I don't remember having ever seen an identifier to -1. Is it possible?

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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.
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