1、1三維圖形一.三維曲線plot3(x1,y1,z1,選項(xiàng)1,x2,y2,z2,選項(xiàng)2,xn,yn,zn選項(xiàng)n)其中每一組x,y,z組成一組曲線得坐標(biāo)參數(shù)，選項(xiàng)得定義與plot函數(shù)相同。當(dāng)x,y,z就是同維向量時(shí)，則x,y,z對(duì)應(yīng)元素構(gòu)成一條三維曲線。當(dāng)x,y,z就是同維矩陣時(shí)，則以x,y,z對(duì)應(yīng)列元素繪制三維曲線，曲線條數(shù)等于矩陣列數(shù)。Example1、繪制三維曲線。程序如下：clf,t=0:pi/100:20*pi;x=sin；y=cos；z=t、*sin(t)、*cos(t);%向量得乘除哥運(yùn)算前面要加點(diǎn)plot3(x,y,z);title('Linein3-DSpace'

2、);xlabel('X');ylabel('Y');zlabel(Z);gridon;所得圖形如下：Linein3-DSpace40y20一Z0.-20-4010.5二.三維曲面1、產(chǎn)生三維數(shù)據(jù)在MATLAB中，利用meshgrid函數(shù)產(chǎn)生平面區(qū)域內(nèi)得網(wǎng)格坐標(biāo)矩陣。語句執(zhí)行后，矩陣X得每一行都就是向量x,行數(shù)等于向量y得元素得個(gè)數(shù)，矩陣Y得每一列都就是向量y,列數(shù)等于向量x得元素得個(gè)數(shù)。2、繪制三維曲面得函數(shù)surf函數(shù)與mesh函數(shù)example2、繪制三維曲面圖z=sin(x+sin(y)-x/10。程序如下：clf,x,y=meshgrid(0:0、25:

3、4*pi);%產(chǎn)生平面坐標(biāo)區(qū)域內(nèi)得網(wǎng)格坐標(biāo)矩陣z=sin(x+sin(y)-x、/10;surf(x,y,z);axis(04*pi04*pi-2、51);title('surf函數(shù)所產(chǎn)生得曲面');figure;mesh(x,y,z);axis(04*pi04*pi-2、51);title('mesh函數(shù)所產(chǎn)生得曲面');surf函數(shù)所產(chǎn)生的曲面1 -0.5 -0 -0.5 -1 -1.5 -2 -2.5 -105510mesh函數(shù)所產(chǎn)生的曲面1一0.5-0-0.5-1-1.5-l-2-2.5-1010500Example3、繪制4種三維曲面圖。clf,x,y

4、=meshgrid(-10:0、8:10);z=sin(sqrt(x、A2+y、人2)、/sqrt(x、A2+y>A2);subplot(2,2,1);mesh(x,y,z);title('mesh(x,y,z)')subplot(2,2,2);meshc(x,y,z);title('meshc(x,y,z)')subplot(2,2,3);meshz(x,y,z)title('meshz(x,y,z)')subplot(2,2,4);surf(x,y,z);title('surf(x,y,z)')圖像如下：10mesh(x

5、,y,z)1010meshc(x,y,z)10-10 -10surf(x,y,z)-10-10meshz(x,y,z)10101010-10 -10-10-103、標(biāo)準(zhǔn)三維曲面sphere函數(shù)得調(diào)用格式為：x,y,z=sphere(n)cylinder函數(shù)得調(diào)用格式為：x,y,z=cylinder(R,n)MATLAB還有一個(gè)peaks函數(shù)，稱為多峰函數(shù)，常用于三維曲面得演示。Example4繪制標(biāo)準(zhǔn)三維曲面圖形。clearall；t=0:pi/20:2*pi;x,y,z=cylinder(2+sin(t),30);subplot(2,2,1);surf(x,y,z);title('x,y,z=cylinder(2+sin(t),30)')subplot(2,2,2);x,y,z=sphere;%20X20surf(x,y,z);title('x,y,z=sphere')subplot(2,1,2);x,y,z=peaks(30);%30X30surf(x,y,z);title('x,y,z=pe