1、三维螺线例子：
t=0:pi/50:10*pi;
x=sin(t);y=cos(t);z=t;
h=plot3(x,y,z);
set(h,'LineWidth',4*get(h,'LineWidth'));
grid
图像如下：
t=0:pi/50:10*pi;
x=sin(t);y=cos(t);z=t;
h=plot3(x,y,z);
set(h,'LineWidth',4*get(h,'LineWidth'));
grid
2、用plot3函数重叠绘制多条曲线
x=linspace(0,3*pi);
z1=sin(x);
z2=sin(2*x);
z3=sin(3*x);
y1=zeros(size(x));
y3=zeros(size(x));
y2=y3/2;
plot3(x,y1,z1,x,y2,z2,x,y3,z3);
grid
xlabel('x-axis');
ylabel('y-axis');
zlabel('z-axis');
title('sin(x),sin(2x),sin(3x)');
图像如下：
x=linspace(0,3*pi);
z1=sin(x);
z2=sin(2*x);
z3=sin(3*x);
y1=zeros(size(x));
y3=zeros(size(x));
y2=y3/2;
plot3(x,y1,z1,x,y2,z2,x,y3,z3);
grid
xlabel('x-axis');
ylabel('y-axis');
zlabel('z-axis');
title('sin(x),sin(2x),sin(3x)');
3、三维网格图：
[x,y,z]=peaks(30);
mesh(x,y,z);
grid;
xlabel('x-axis');,ylabel('y-axis'),zlabel('z-axis');
title('MESH of PEAKS');
图像如下：
[x,y,z]=peaks(30);
mesh(x,y,z);
grid;
xlabel('x-axis');,ylabel('y-axis'),zlabel('z-axis');
title('MESH of PEAKS');
[x,y,z]=peaks;
subplot(221);
meshz(x,y,z);
axis([-inf inf -inf inf -inf inf]);
subplot(222);
waterfall(x,y,z);
axis([-inf inf -inf inf -inf inf]);
subplot(223);
meshc(x,y,z);
axis([-inf inf -inf inf -inf inf]);
subplot(224);
surfc(x,y,z);
axis([-inf inf -inf inf -inf inf]);
图像如下：
[x,y,z]=peaks;
subplot(221);
meshz(x,y,z);
axis([-inf inf -inf inf -inf inf]);
subplot(222);
waterfall(x,y,z);
axis([-inf inf -inf inf -inf inf]);
subplot(223);
meshc(x,y,z);
axis([-inf inf -inf inf -inf inf]);
subplot(224);
surfc(x,y,z);
axis([-inf inf -inf inf -inf inf]);
4、三维曲面图
[x,y,z]=peaks(30);
surf(x,y,z);
grid
xlabel('x-axis');,ylabel('y-axis'),zlabel('z-axis');
title('SURF of PEAKS');
图像如下：
[x,y,z]=peaks(30);
surf(x,y,z);
grid
xlabel('x-axis');,ylabel('y-axis'),zlabel('z-axis');
title('SURF of PEAKS');
mesh和surf的显示比较
x=-2:0.1:2;
[x,y]=meshgrid(x,x);
r=sqrt(x.^2+x.^2)+eps;
z=sinc(r);
subplot(211);
mesh(z);
subplot(212);
surf(x,y,z);
图像如下：
x=-2:0.1:2;
[x,y]=meshgrid(x,x);
r=sqrt(x.^2+x.^2)+eps;
z=sinc(r);
subplot(211);
mesh(z);
subplot(212);
surf(x,y,z);
