Please explain, what "crash" exactly mean: Do you get an error message?
You want to draw one million circles in a diagram? Beside the crash, do you assume that the resulting graphics could be useful to demonstrate anything?
Try to specify the renderer:
x = linspace(1, 100, 1e6);
y = x^2;
figure('Renderer', 'OpenGL');
opengl software
plot(x, y, 'o');
opengl hardware
plot(x, y, 'o');
figure('Renderer', 'ZBuffer');
plot(x, y, 'o');
figure('Renderer', 'Painters');
plot(x, y, 'o');
If only the OpenGL hardware method crashs, try to update the drivers of your graphics card.
