bsp;quadratic&nbsp;mapping.&nbsp;An&nbsp;
</span><br>
<span class=help>%&nbsp;&nbsp;&nbsp;input&nbsp;vector&nbsp;x=X(:,i)&nbsp;is&nbsp;mapped&nbsp;to&nbsp;its&nbsp;image&nbsp;y=Y(:,i)&nbsp;such&nbsp;that
</span><br>
<span class=help>%
</span><br>
<span class=help>%&nbsp;&nbsp;&nbsp;&nbsp;y&nbsp;=&nbsp;[x(1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;x(2)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;;...;x(n);
</span><br>
<span class=help>%&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;x(1)*x(1);x(1)*x(2);...;x(1)*x(n);
</span><b