function nearest($vec)
{
$min = -1;
$minN;
$vecs = $this->vecs;
foreach ($vecs as $name => $cvec) {
$d = VecUtil::dist($vec, $cvec);
if ($min < 0 || $d < $min) {
$minN = $name;
$min = $d;
}
}
return array($minN, $d);
}
