octave: error in closing file

[ubisum]

hi everyone.
I wrote an octave function that opens a file for reading, reads some
information from it and then attempts to close it.
The file is correctly opened and reading is performed. When trying to close
file, at the end of function, I get the following error: /error: fclose:
invalid stream number = -/1.

Do you know any reason? 

thanks for help.



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