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From: "Sadik " <sadik.hava@gmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Undefined function 'le' for input arguments of type 'cell'.
Date: Sat, 6 Jul 2013 17:22:10 +0000 (UTC)
Organization: University of North Carolina Chapel Hill
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Hi Bryan,

You should use curly braces as in 

if a{j} <= b{k}

Best.