Question

matlab如何用6点画椭圆

Answer 1

I think I was kind of solving out your question, but I am not very good at data visulation. So what I tried was to use 'fit curve' command to achieve your effect of some kind.

clear all

x = pi*(0:.5:2);

y = [0 2 0 -2 0 2 0;
     1 0 1 0 -1 0 1];
 
pp = spline(x,y);
yy = ppval(pp, linspace(0,2*pi,101));
 
plot(yy(1,:), yy(2,:), '-b', y(1,2:5), y(2,2:5), 'or'), axis equal

Note: y(1,:) and y(2,:) stand for  the value of x and y. The result of code generated is shown below. Hope you could get some idea of my incompetent code.