— Function File: idx = dsearchn (x, tri, xi)
— Function File: idx = dsearchn (x, tri, xi, outval)
— Function File: idx = dsearchn (x, xi)
— Function File: [idx, d] = dsearchn (...)
Returns the index idx or the closest point in x to the elements
xi. If outval is supplied, then the values of xi that are
not contained within one of the simplicies tri are set to
outval. Generally, tri is returned from delaunayn
(x).