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########################################################################
##
## Copyright (C) 2008-2024 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 {} {} plotmatrix (@var{x}, @var{y})
## @deftypefnx {} {} plotmatrix (@var{x})
## @deftypefnx {} {} plotmatrix (@dots{}, @var{style})
## @deftypefnx {} {} plotmatrix (@var{hax}, @dots{})
## @deftypefnx {} {[@var{h}, @var{ax}, @var{bigax}, @var{p}, @var{pax}] =} plotmatrix (@dots{})
## Scatter plot of the columns of one matrix against another.
##
## Given the arguments @var{x} and @var{y} that have a matching number of
## rows, @code{plotmatrix} plots a set of axes corresponding to
##
## @example
## plot (@var{x}(:, i), @var{y}(:, j))
## @end example
##
## When called with a single argument @var{x} this is equivalent to
##
## @example
## plotmatrix (@var{x}, @var{x})
## @end example
##
## @noindent
## except that the diagonal of the set of axes will be replaced with the
## histogram @code{hist (@var{x}(:, i))}.
##
## The marker to use can be changed with the @var{style} argument, that is a
## string defining a marker in the same manner as the @code{plot} command.
##
## If the first argument @var{hax} is an axes handle, then plot into this axes,
## rather than the current axes returned by @code{gca}.
##
## The optional return value @var{h} provides handles to the individual
## graphics objects in the scatter plots, whereas @var{ax} returns the
## handles to the scatter plot axes objects.
##
## @var{bigax} is a hidden axes object that surrounds the other axes, such
## that the commands @code{xlabel}, @code{title}, etc., will be associated
## with this hidden axes.
##
## Finally, @var{p} returns the graphics objects associated with the histogram
## and @var{pax} the corresponding axes objects.
##
## Example:
##
## @example
## plotmatrix (randn (100, 3), "g+")
## @end example
##
## @seealso{scatter, plot}
## @end deftypefn
function [h, ax, bigax, p, pax] = plotmatrix (varargin)
[bigax2, varargin, nargin] = __plt_get_axis_arg__ ("plotmatrix", varargin{:});
if (nargin < 1 || nargin > 3)
print_usage ();
endif
oldfig = [];
if (! isempty (bigax2))
oldfig = get (0, "currentfigure");
endif
unwind_protect
bigax2 = newplot (bigax2);
[h2, ax2, p2, pax2] = __plotmatrix__ (bigax2, varargin{:});
axes (bigax2);
ctext = text (0, 0, "", "visible", "off",
"handlevisibility", "off", "xliminclude", "off",
"yliminclude", "off", "zliminclude", "off",
"deletefcn", {@plotmatrixdelete, [ax2; pax2]});
set (bigax2, "visible", "off");
unwind_protect_cleanup
if (! isempty (oldfig))
set (0, "currentfigure", oldfig);
endif
end_unwind_protect
if (nargout > 0)
h = h2;
ax = ax2;
bigax = bigax2;
p = p2;
pax = pax2;
endif
endfunction
%!demo
%! clf;
%! plotmatrix (randn (100, 3), "g+");
%! title ("plotmatrix() demo #1");
function plotmatrixdelete (h, ~, ax)
for i = 1 : numel (ax)
hc = ax(i);
if (isaxes (hc) && strcmpi (get (hc, "beingdeleted"), "off"))
parent = get (hc, "parent");
## If the parent is invalid or being deleted, then do nothing
if (ishghandle (parent) && strcmpi (get (parent, "beingdeleted"), "off"))
delete (hc);
endif
endif
endfor
endfunction
function [h, ax, p, pax] = __plotmatrix__ (bigax, varargin)
have_line_spec = false;
have_hist = false;
parent = get (bigax, "parent");
narg = nargin ();
for i = 1 : narg - 1
arg = varargin{i};
if (ischar (arg) || iscellstr (arg))
[linespec, valid] = __pltopt__ ("plotmatrix", varargin{i}, false);
if (valid)
have_line_spec = true;
linespec = varargin(i);
varargin(i) = [];
narg -= 1;
break;
else
print_usage ("plotmatrix");
endif
endif
endfor
if (narg == 2)
X = varargin{1};
Y = X;
have_hist = true;
elseif (narg == 3)
X = varargin{1};
Y = varargin{2};
else
print_usage ("plotmatrix");
endif
if (rows (X) != rows (Y))
error ("plotmatrix: dimension mismatch in the arguments");
endif
m = columns (X);
n = columns (Y);
h = [];
ax = [];
p = [];
pax = [];
xsize = 0.9 / m;
ysize = 0.9 / n;
xoff = 0.05;
yoff = 0.05;
border = [0.130, 0.110, 0.225, 0.185] .* [xsize, ysize, xsize, ysize];
border(3:4) = - border(3:4) - border(1:2);
for i = 1 : m
for j = 1 : n
pos = [xsize * (i - 1) + xoff, ysize * (n - j) + yoff, xsize, ysize];
tmp = axes ("outerposition", pos, "position", pos + border,
"parent", parent);
if (i == j && have_hist)
pax = [pax ; tmp];
[nn, xx] = hist (X(:, i));
tmp = bar (xx, nn, 1.0);
p = [p; tmp];
else
ax = [ax ; tmp];
if (have_line_spec)
tmp = plot (X (:, i), Y (:, j), linespec);
else
tmp = plot (X (:, i), Y (:, j), ".");
endif
h = [h ; tmp];
endif
endfor
endfor
endfunction
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