Na Line 3: Parse error at <EOL>: usage might be invalid MATLAB syntax.

Na

Line 3: Parse error at EOL: usage might be invalid MATLAB syntax.

[Walter Roberson]

That line or the line before is incomplete

For example you might have had code similar to

   if
     x>3
     disp('okay')
   end

then that would fail because the condition needs to be on the same line as the "if"