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Matlab: Changing the line properties of a loaded figure?
hline = findobj(gcf, 'type', 'line');

set(hline,'LineWidth',3)

set(hline(1),'LineWidth',3)
set(hline(2:3),'LineStyle',':')
idx = [4 5];
set(hline(idx),'Marker','*')

x = 0:0.1:2;
plot(x,sin(x));

fig = gcf % get a handle to the current figure
% get handles to the children of that figure: the axes in this case
ax = get(fig,'children')
% get handles to the elements in the axes: a single line plot here
h = get(ax,'children')
% manipulate desired properties of the line, e.g. line width
set(h,'LineWidth',3)