t = 0:0.01:300;
g=E*cos(w*t) .* exp(-s*t) .*cos((2*pi/T)+v);
caption = sprintf('Plot of %d points', length(t));
title(caption, 'FontSize', 20);
Though with 30,0001 points, and a monitor that is only 1980 pixels across, the plot looks solid. If you reduce the number of points, you'll see something but it won't be the original signal - it will be a subsampled version and could be very deceptive to look at that and think that is what the curve looks like for an infinite number of points.