--- a/scripts/ChangeLog
+++ b/scripts/ChangeLog
@@ -1,3 +1,13 @@
+2010-07-07  David Bateman  <dbateman@free.fr>
+
+	* __next_line_color__.m: Allow conditional initialisation of the
+	color_rotation variable.
+	* __next_line_style__.m: Allow conditional initialisation of the
+	style_rotation variable.
+	* hold.m: Support "hold all".
+	* newplot.m: Conditionally initialisation the line style and color
+	based on the __hold_all__ axes property.
+
 2010-07-04  Soren Hauberg  <hauberg@gmail.com>
 
 	* polynomial/deconv.m: ensure that the orientation of the third

--- a/scripts/plot/__next_line_color__.m
+++ b/scripts/plot/__next_line_color__.m
@@ -32,10 +32,12 @@
   persistent color_index;
 
   if (nargin < 2)
-    if (nargin == 1 && reset)
-      color_rotation = get (gca (), "colororder");
-      num_colors = rows (color_rotation);
-      color_index = 1;
+    if (nargin == 1) 
+      if (reset || isempty (color_rotation))
+        color_rotation = get (gca (), "colororder");
+        num_colors = rows (color_rotation);
+        color_index = 1;
+      endif
     elseif (! isempty (color_rotation))
       rgb = color_rotation(color_index,:);
       if (++color_index > num_colors)

--- a/scripts/plot/__next_line_style__.m
+++ b/scripts/plot/__next_line_style__.m
@@ -38,7 +38,7 @@
         elseif (++style_index > num_styles)
           style_index = 1;
         endif
-      elseif (reset)
+      elseif (reset || isempty (style_rotation))
         style_rotation = strsplit (get (gca (), "linestyleorder"), "|");
         num_styles = length (style_rotation);
         style_index = 1;

--- a/scripts/plot/hold.m
+++ b/scripts/plot/hold.m
@@ -29,6 +29,11 @@
 ## Retain plot data and settings so that subsequent plot commands are displayed
 ## on a single graph.
 ##
+## @item hold all
+## Retain plot line color, line style, data and settings so that subsequent
+## plot commands are displayed on a single graph with the next line color and
+## style.
+##
 ## @item hold off
 ## Clear plot and restore default graphics settings before each new plot
 ## command.  (default).
@@ -57,6 +62,7 @@
     nargs = numel (varargin);
   endif
 
+  hold_all = false;
   if (nargs == 0)
     turn_hold_off = ishold (ax);
   elseif (nargs == 1)
@@ -64,6 +70,9 @@
     if (ischar (state))
       if (strcmpi (state, "off"))
         turn_hold_off = true;
+      elseif (strcmpi (state, "all"))
+        turn_hold_off = false;
+        hold_all = true;
       elseif (strcmpi (state, "on"))
         turn_hold_off = false;
       else
@@ -80,6 +89,7 @@
     set (ax, "nextplot", "add");
     set (fig, "nextplot", "add");
   endif
+  set (ax, "__hold_all__", hold_all);
 
 endfunction
 

--- a/scripts/plot/newplot.m
+++ b/scripts/plot/newplot.m
@@ -26,8 +26,6 @@
 function newplot ()
 
   if (nargin == 0)
-    __next_line_color__ (true);
-    __next_line_style__ (true);
     cf = gcf ();
     fnp = get (cf, "nextplot");
     switch (fnp)
@@ -43,6 +41,13 @@
     endswitch
     ca = gca ();
     anp = get (ca, "nextplot");
+    if (strcmp (get (ca, "__hold_all__"), "off"))
+      __next_line_color__ (true);
+      __next_line_style__ (true);
+    else
+      __next_line_color__ (false);
+      __next_line_style__ (false);
+    endif
     switch (anp)
       case "new"
       case "add"

--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2010-07-07  David Bateman  <dbateman@free.fr>
+
+	* graphics.h.in (axes): Add hidden property __hold_all.
+
 2010-07-07  Jaroslav Hajek  <highegg@gmail.com>
 
 	* ov-class.h (octave_class::map): Turn to octave_map.

--- a/src/graphics.h.in
+++ b/src/graphics.h.in
@@ -2993,6 +2993,7 @@
       radio_property yaxislocation , "{left}|right|zero"
       radio_property xaxislocation , "{bottom}|top|zero"
       array_property view u , Matrix ()
+      bool_property __hold_all__ h , "off"
       radio_property nextplot , "new|add|replacechildren|{replace}"
       array_property outerposition u , default_axes_outerposition ()
       radio_property activepositionproperty , "{outerposition}|position"