Importing data from excel file.

[CodeOctave]

Hi,
I just started using Octave as an alternative to Matlab. 
I have been trying to import data for the last hour or so with no success.
Can someone clearly explain and show me how it is done?
Also where the file should be located. 
In addition, I was able to open the excel file through Octave. Is there a
purpose for this? 

This is one example of my attempts.
>> A = xlsread('Lithium_Cell_#3_July8, 2015', 'Sheet1', 'A1:A2')
warning: Functions for spreadsheet style I/O (.xls .xlsx .sxc .ods .dbf .wk1
etc.) are provided in the io package. See `http://octave.sf.net/io/'.

Please read `http://www.octave.org/missing.html' to learn how you can
contribute missing functionality.

error: 'xlsread' undefined near line 1 column 5



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