?? drawparabola.m
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function drawparabola (z, a, alpha)%DRAWPARABOLA%% drawparabola (z, a, alpha)% draw parabola for a*(x - z(1))^2 + (y - z(2)) = 0% rotated by alpha% s = sin(alpha); c = cos(alpha); Q = [c -s; s c]; theta = [-10:0.2:10]; u = diag(z)*ones(2,length(theta)) + ... Q*[theta; a*theta.*theta]; plot(u(1,:),u(2,:));end % drawparabola?? 快捷鍵說明
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