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kernel_density_nodes.m

# Copyright (C) 2006, 2007  Michael Creel <michael.creel@uab.es>
# under the terms of the GNU General Public License.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; If not, see <http://www.gnu.org/licenses/>.

# kernel_density_nodes: for internal use by kernel_density - does calculations on nodes

function z = kernel_density_nodes(eval_points, data, do_cv, kernel, points_per_node, nslaves, debug)

      if (nslaves > 0)
            global NEWORLD
            [info, myrank] = MPI_Comm_rank(NEWORLD);
      else myrank = 0; # if not parallel then do all on master node
      endif

      if myrank == 0 # Do this if I'm master
            startblock = nslaves*points_per_node + 1;
            endblock = rows(eval_points);
      else  # this is for the slaves
            startblock = myrank*points_per_node - points_per_node + 1;
            endblock = myrank*points_per_node;
      endif

      # the block of eval_points this node does
      myeval = eval_points(startblock:endblock,:);
      nn = rows(myeval);
      n = rows(data);

      W = __kernel_weights(data, myeval, kernel);
      if (do_cv)
            W = W - diag(diag(W));
            z = sum(W,2) / (n-1);
      else
            z = sum(W,2) / n;
      endif

      if debug
            printf("z on node %d: \n", myrank);
            z'
      endif
endfunction



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