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+## Copyright (C) 1996-2012 John W. Eaton
+##
+## 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
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} plot3 (@var{args})
+## Produce three-dimensional plots.  Many different combinations of
+## arguments are possible.  The simplest form is
+##
+## @example
+## plot3 (@var{x}, @var{y}, @var{z})
+## @end example
+##
+## @noindent
+## in which the arguments are taken to be the vertices of the points to
+## be plotted in three dimensions.  If all arguments are vectors of the
+## same length, then a single continuous line is drawn.  If all arguments
+## are matrices, then each column of the matrices is treated as a
+## separate line.  No attempt is made to transpose the arguments to make
+## the number of rows match.
+##
+## If only two arguments are given, as
+##
+## @example
+## plot3 (@var{x}, @var{c})
+## @end example
+##
+## @noindent
+## the real and imaginary parts of the second argument are used
+## as the @var{y} and @var{z} coordinates, respectively.
+##
+## If only one argument is given, as
+##
+## @example
+## plot3 (@var{c})
+## @end example
+##
+## @noindent
+## the real and imaginary parts of the argument are used as the @var{y}
+## and @var{z} values, and they are plotted versus their index.
+##
+## Arguments may also be given in groups of three as
+##
+## @example
+## plot3 (@var{x1}, @var{y1}, @var{z1}, @var{x2}, @var{y2}, @var{z2}, @dots{})
+## @end example
+##
+## @noindent
+## in which each set of three arguments is treated as a separate line or
+## set of lines in three dimensions.
+##
+## To plot multiple one- or two-argument groups, separate each group
+## with an empty format string, as
+##
+## @example
+## plot3 (@var{x1}, @var{c1}, "", @var{c2}, "", @dots{})
+## @end example
+##
+## An example of the use of @code{plot3} is
+##
+## @example
+## @group
+## z = [0:0.05:5];
+## plot3 (cos (2*pi*z), sin (2*pi*z), z, ";helix;");
+## plot3 (z, exp (2i*pi*z), ";complex sinusoid;");
+## @end group
+## @end example
+## @seealso{plot, xlabel, ylabel, zlabel, title, print}
+## @end deftypefn
+
+## Author: Paul Kienzle
+##         (modified from __plt__.m)
+
+function retval = plot3 (varargin)
+
+  newplot ();
+
+  x_set = 0;
+  y_set = 0;
+  z_set = 0;
+  property_set = 0;
+  fmt_set = 0;
+  properties = {};
+  tlgnd = {};
+  hlgnd = [];
+  idx = 0;
+
+  ## Gather arguments, decode format, and plot lines.
+  arg = 0;
+  while (arg++ < nargin)
+    new = varargin{arg};
+    new_cell = varargin(arg);
+
+    if (property_set)
+      properties = [properties, new_cell];
+      property_set = 0;
+      continue;
+    endif
+
+    if (ischar (new))
+      if (! z_set)
+        if (! y_set)
+          if (! x_set)
+            error ("plot3: needs x, [ y, [ z ] ]");
+          else
+            z = imag (x);
+            y = real (x);
+            y_set = 1;
+            z_set = 1;
+            if (rows(x) > 1)
+              x = repmat ((1:rows(x))', 1, columns(x));
+            else
+              x = 1:columns(x);
+            endif
+          endif
+        else
+          z = imag (y);
+          y = real (y);
+          z_set = 1;
+        endif
+      endif
+
+      if (! fmt_set)
+        [options, valid] = __pltopt__ ("plot3", new, false);
+        if (! valid)
+          properties = [properties, new_cell];
+          property_set = 1;
+          continue;
+        else
+          fmt_set = 1;
+          while (arg < nargin && ischar (varargin{arg+1}))
+            if (nargin - arg < 2)
+              error ("plot3: properties must appear followed by a value");
+            endif
+            properties = [properties, varargin(arg+1:arg+2)];
+            arg += 2;
+          endwhile
+        endif
+      else
+        properties = [properties, new_cell];
+        property_set = 1;
+        continue;
+      endif
+
+      if (isvector (x) && isvector (y))
+        if (isvector (z))
+          x = x(:);
+          y = y(:);
+          z = z(:);
+        elseif (length (x) == rows (z) && length (y) == columns (z))
+          [x, y] = meshgrid (x, y);
+        else
+          error ("plot3: [length(x), length(y)] must match size(z)");
+        endif
+      endif
+
+      if (! size_equal (x, y, z))
+        error ("plot3: x, y, and z must have the same shape");
+      elseif (ndims (x) > 2)
+        error ("plot3: x, y, and z must not have more than two dimensions");
+      endif
+
+      for i = 1 : columns (x)
+        linestyle = options.linestyle;
+        marker = options.marker;
+        if (isempty (marker) && isempty (linestyle))
+           [linestyle, marker] = __next_line_style__ ();
+        endif
+        color = options.color;
+        if (isempty (color))
+          color = __next_line_color__ ();
+        endif
+
+        tmp(++idx) = line (x(:, i), y(:, i), z(:, i),
+                           "color", color, "linestyle", linestyle,
+                           "marker", marker, properties{:});
+        key = options.key;
+        if (! isempty (key))
+          hlgnd = [hlgnd, tmp(idx)];
+          tlgnd = {tlgnd{:}, key};
+        endif
+      endfor
+
+      x_set = 0;
+      y_set = 0;
+      z_set = 0;
+      fmt_set = 0;
+      properties = {};
+    elseif (! x_set)
+      x = new;
+      x_set = 1;
+    elseif (! y_set)
+      y = new;
+      y_set = 1;
+    elseif (! z_set)
+      z = new;
+      z_set = 1;
+    else
+      if (isvector (x) && isvector (y))
+        if (isvector (z))
+          x = x(:);
+          y = y(:);
+          z = z(:);
+        elseif (length (x) == rows (z) && length (y) == columns (z))
+          [x, y] = meshgrid (x, y);
+        else
+          error ("plot3: [length(x), length(y)] must match size(z)");
+        endif
+      endif
+
+      if (! size_equal (x, y, z))
+        error ("plot3: x, y, and z must have the same shape");
+      elseif (ndims (x) > 2)
+        error ("plot3: x, y, and z must not have more than two dimensions");
+      endif
+
+      options =  __default_plot_options__ ();
+      for i = 1 : columns (x)
+        linestyle = options.linestyle;
+        marker = options.marker;
+        if (isempty (marker) && isempty (linestyle))
+           [linestyle, marker] = __next_line_style__ ();
+        endif
+        color = options.color;
+        if (isempty (color))
+          color = __next_line_color__ ();
+        endif
+
+        tmp(++idx) = line (x(:, i), y(:, i), z(:, i),
+                           "color", color, "linestyle", linestyle,
+                           "marker", marker, properties{:});
+        key = options.key;
+        if (! isempty (key))
+          hlgnd = [hlgnd, tmp(idx)];
+          tlgnd = {tlgnd{:}, key};
+        endif
+      endfor
+
+      x = new;
+      y_set = 0;
+      z_set = 0;
+      fmt_set = 0;
+      properties = {};
+    endif
+
+  endwhile
+
+  if (property_set)
+    error ("plot3: properties must appear followed by a value");
+  endif
+
+  ## Handle last plot.
+
+  if (x_set)
+    if (y_set)
+      if (! z_set)
+        z = imag (y);
+        y = real (y);
+        z_set = 1;
+      endif
+    else
+      z = imag (x);
+      y = real (x);
+      y_set = 1;
+      z_set = 1;
+      if (rows (x) > 1)
+        x = repmat ((1:rows (x))', 1, columns(x));
+      else
+        x = 1:columns(x);
+      endif
+    endif
+
+    if (isvector (x) && isvector (y))
+      if (isvector (z))
+        x = x(:);
+        y = y(:);
+        z = z(:);
+      elseif (length (x) == rows (z) && length (y) == columns (z))
+        [x, y] = meshgrid (x, y);
+      else
+        error ("plot3: [length(x), length(y)] must match size(z)");
+      endif
+    endif
+
+    if (! size_equal (x, y, z))
+      error ("plot3: x, y, and z must have the same shape");
+    elseif (ndims (x) > 2)
+      error ("plot3: x, y, and z must not have more than two dimensions");
+    endif
+
+    options =  __default_plot_options__ ();
+
+    for i = 1 : columns (x)
+      linestyle = options.linestyle;
+      marker = options.marker;
+      if (isempty (marker) && isempty (linestyle))
+        [linestyle, marker] = __next_line_style__ ();
+      endif
+      color = options.color;
+      if (isempty (color))
+        color = __next_line_color__ ();
+      endif
+
+      tmp(++idx) = line (x(:, i), y(:, i), z(:, i),
+                         "color", color, "linestyle", linestyle,
+                         "marker", marker, properties{:});
+      key = options.key;
+      if (! isempty (key))
+        hlgnd = [hlgnd, tmp(idx)];
+        tlgnd = {tlgnd{:}, key};
+      endif
+    endfor
+  endif
+
+  if (!isempty (hlgnd))
+    legend (gca(), hlgnd, tlgnd);
+  endif
+
+  set (gca (), "view", [-37.5, 30]);
+
+  if (nargout > 0 && idx > 0)
+    retval = tmp;
+  endif
+
+endfunction
+
+%!demo
+%! clf
+%! z = [0:0.05:5];
+%! plot3 (cos(2*pi*z), sin(2*pi*z), z, ";helix;");
+%! plot3 (z, exp(2i*pi*z), ";complex sinusoid;");