ist2.html">VL_ALLDIST2</a>(...,'METRIC') changes the computed distance. Supported
values for METRIC are
</p><pre>
 METRIC  D(i,j)
 --------------------------------------------------------
  LINF   max |X  - Y|
  L2     sum (X  - Y).^2
  L1     sum |X  - Y|
  L0     sum (X ~= Y)
  CHI2   sum (X  - Y).^2 ./ (X + Y)
  HELL   sum (X^.5 - Y^.5) .^ 2
</pre><p>
(Notice that the standard definition of chi2 is half of what is
computed here).
</p><p>
<a href="vl_alldist2.html">VL_ALLDIST2</a>(...,'KERNEL') computes t