time   calls  line
                  1 function holdstate = ishold(ca)
                  2 %ISHOLD Return hold state.
                  3 %   ISHOLD returns 1 if hold is on, and 0 if it is off.
                  4 %   When HOLD is ON, the current plot and all axis properties
                  5 %   are held so that subsequent graphing commands add to the 
                  6 %   existing graph.
                  7 %
                  8 %   Hold on means the NextPlot property of both figure
                  9 %   and axes is set to "add".
                 10 %
                 11 %   See also HOLD, NEWPLOT, FIGURE, AXES.
                 12 
                 13 %   Copyright 1984-2003 The MathWorks, Inc.
                 14 %   $Revision: 5.11.4.2 $  $Date: 2004/04/10 23:28:51 $
                 15 
                 16 %ISHOLD(AXH) returns whether hold is on for the specified axis
                 17 
             6   18 if nargin<1 
                 19     cf = gcf;
                 20     ca = get(cf,'currentaxes');
                 21     if isempty(ca)
                 22         holdstate = 0;
                 23         return;
                 24     end
             6   25 else 
             6   26     ca=ca(1); 
             6   27     cf = ancestor(ca,'figure'); 
             6   28 end 
                 29 
             6   30 holdstate = strcmp(get(ca,'nextplot'),'add') & ... 
             6   31            strcmp(get(cf,'nextplot'),'add');