matlab quiver()画箭头的函数

p1 = [2 3];                         % First Point
p2 = [9 8];                         % Second Point
dp = p2-p1;                         % Difference
figure(1)
quiver(p1(1),p1(2),dp(1),dp(2),0)
grid
axis([0  10    0  10])
text(p1(1),p1(2), sprintf('(%.0f,%.0f)',p1))
text(p2(1),p2(2), sprintf('(%.0f,%.0f)',p2))

 调整箭头大小的代码：

quiver(x0,y0,x1,y1,'MaxHeadSize',0.05,'AutoScaleFactor',0.89,'AutoScale','off');

h = quiver ...
set(h,'autoscalefactor',2);
调节这个数可以改变箭头的长度。