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########################################################################
##
## Copyright (C) 2005-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## This file is part of Octave.
##
## Octave 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 3 of the License, or
## (at your option) any later version.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {} gplot (@var{A}, @var{xy})
## @deftypefnx {} {} gplot (@var{A}, @var{xy}, @var{line_style})
## @deftypefnx {} {[@var{x}, @var{y}] =} gplot (@var{A}, @var{xy})
## Plot a graph defined by @var{A} and @var{xy} in the graph theory sense.
##
## @var{A} is the adjacency matrix of the array to be plotted and @var{xy} is
## an @var{n}-by-2 matrix containing the coordinates of the nodes of the graph.
##
## The optional parameter @var{line_style} defines the output style for the
## plot. Called with no output arguments the graph is plotted directly.
## Otherwise, return the coordinates of the plot in @var{x} and @var{y}.
## @seealso{treeplot, etreeplot, spy}
## @end deftypefn
function [x, y] = gplot (A, xy, line_style)
if (nargin < 2)
print_usage ();
endif
if (nargin == 2)
line_style = "-";
endif
[i, j] = find (A);
xcoord = [xy(i,1), xy(j,1), NaN(length(i),1) ]'(:);
ycoord = [xy(i,2), xy(j,2), NaN(length(i),1) ]'(:);
if (nargout == 0)
plot (xcoord, ycoord, line_style);
else
x = xcoord;
y = ycoord;
endif
endfunction
%!demo
%! ## Binary Tree Representation
%! A = [0 1 0 0 0 0 0
%! 1 0 1 1 0 0 0
%! 0 1 0 0 0 0 0
%! 0 1 0 0 1 0 0
%! 0 0 0 1 0 1 1
%! 0 0 0 0 1 0 0
%! 0 0 0 0 1 0 0];
%!
%! xy = [1 , 0
%! 1.5, 1
%! 2 , 0
%! 2.5, 2
%! 3.5, 1
%! 3 , 0
%! 4 , 0];
%!
%! clf;
%! gplot (A, xy, "o-");
%! set (get (gca, ("children")), "markersize", 12);
%! title ("gplot() of Binary Tree Adjacency matrix");
## Mark graphical function as tested by demo block
%!assert (1)
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