cannot read excel file with Octave

[Acturus13]

Hello, i have found a code on Github written in Matlab. Its not possible for
me to install it so I have downloaded Octave 5.1.0 for windows 7.

I have managed to load the io package ( I have added the "pkg load io"
command at the beginning of the code) which seemed to have help but not
enough.

in the code load_spec  , there is this line : 

[~,~,raw] = xlsread(specfile,'','','basic');

with specfile being  'Spec_US_example.xls'

here is the console output:

(BASIC (BIFF5) support request translated to JXL)
Checking requested interface(s):
JXL is not supported.
error: element number 3 undefined in return list
error: called from
    load_spec at line 30 column 11 

I have read many topics about it but none correspond to my Octave version
and actually my specific problem. That's why I'm posting.


I also tried to read an xslx file instead of an xls but to no avail.


I'm not familiar enough with Matlab syntax to know if there is problem with
the syntax above, or if the problem is coming from elsewhere. 

I have read that with version above 4, there is no problem linked to Java
but I may mistaken.

Thank you for your help









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