if we define dx=x2-x1 and dy=y2-y1, then the normals are (-dy, dx) and (dy, -dx).

这是使用y = x^2

x = 0:0.1:1;
y = x.*x;
dy = gradient(y);
dx = gradient(x);
quiver(x,y,-dy,dx)
hold on; plot( x, y)

给出:

PS: 抱歉，切线示例！！！赶时间.感谢Schorsch和Shawn314！

PS: Sorry about the tangential example!!! Got in a hurry. Thanks to Schorsch and Shawn314!

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