(octave.info)Block Comments

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2.7.2 Block Comments
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Entire blocks of code can be commented by enclosing the code between
matching ‘#{’ and ‘#}’ or ‘%{’ and ‘%}’ markers.  For example,

     function quick_countdown
       # Count down for main rocket engines
       disp (3);
      #{
       disp (2);
       disp (1);
      #}
       disp ("Blast Off!");  # Rocket leaves pad
     endfunction

will produce a very quick countdown from ’3’ to "Blast Off" as the lines
"‘disp (2);’" and "‘disp (1);’" won’t be executed.

   The block comment markers must appear alone as the only characters on
a line (excepting whitespace) in order to be parsed correctly.