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  1. or download this
    use PDL::VectorValued::Utils;
# $pdl is ncoords=3,nvertices=3,ntriangles
my $uniqv = $pdl->uniqvec; # ncoords=3,nunique
my $face_indices = vsearchvec($pdl, $uniqv); # nvertices=3,ntriangles
  2. or download this
    $cube->indexND($coords) .= $count;
  3. or download this
    pdl> $photon_list = new PDL::RandVar->sample(500)->reshape(2,250)*10
pdl> $histogram = zeroes(10,10)
pdl> $histogram->range($photon_list,1)++;  #not what you wanted