Matlab参数方程画曲线：plot与fplot实现

求 x2 - 3x +1 = 0

x = -5:0.1:5;

   y1 = x.x-3x+1;

   y2=zeros( size (x));
plot(x,y1,x,y2);

f = @(x) xx-3x+1

   x1=fzero(f,0.5)

   x2 = fzero(f,2.5)

x = [0.2,1.8,2.5]

   y = [1.3,2.8,1.1]

   z = [0.4,1.2,1.6]

   plot3(x,y,z)
grid on

   axis([0,3,1,3,0,2])

t = linspace(0,10*pi,200) %生成有200个元素的向量t

x = sin(t) + t.* cos (t)

   y = cos(t)-t.*sin(t)

   z = t

   subplot(1,2,1)

   plot3(x,y,z)

   grid on

   subplot(1,2,2)

   plot3(x(1:4:200),y(1:4:200),z(1:4:200))

   grid on

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