The following code, given by one of the contributors long ago, will help you to undo the last plotting step:
function undo_plot(h, n)
% Undo_plot(h, n) undo last 'n' plotting operations from figure(h).
% n is optional and must be a positive integer since it denotes the number of
% steps to go back in the plotting process.
if nargin == 1
n = 1;
end
if n < 1
str = sprintf('It is not humanly/machinely possible to undo %s plotting operations ! ',num2str(n));
errordlg(str,'UNDO_PLOT ERROR');
return
end
figure(h);
children = get(gca, 'children');
for i = 1 : n
delete(children(i));
end
