第五章 matlab绘图g

1、2021-11-1412021-11-1422021-11-1432021-11-1442021-11-1452021-11-1462021-11-1472021-11-1482021-11-1492021-11-14102021-11-14112021-11-14122021-11-14132021-11-1414x=linspace(0,2*pi,1000);y1=0.2*exp(-0.5*x).*cos(4*pi*x);y2=2*exp(-0.5*x).*cos(pi*x);k=find(abs(y1-y2)1e-2);%查找查找y1与与y2相等点相等点(近近似相等似相等)的下标的下标x

2、1=x(k); %取取y1与与y2相等点的相等点的x坐标坐标y3=0.2*exp(-0.5*x1).*cos(4*pi*x1); %求求y1与与y2值相等点的值相等点的y坐标坐标plot(x,y1,x,y2,k:,x1,y3,rp);2021-11-14152021-11-14162021-11-1417x=0:pi/100:2*pi;y1=2*exp(-0.5*x);y2=cos(4*pi*x);plot(x,y1,x,y2)title(x from 0 to 2pi); %加图形标题加图形标题xlabel(variable x); %加加x轴说明轴说明ylabel(variable y);

3、 %加加y轴说明轴说明text(0.8,1.5,曲线曲线y1=2e-0.5x); %在指定位置添加图形说明在指定位置添加图形说明text(2.5,1.1,曲线曲线y2=cos(4pix); legend(y1,y2); %加图例加图例2021-11-14182021-11-14192021-11-1420t=0:0.01:2*pi;x=exp(i*t);y=x;2*x;3*x;plot(y)%grid on; %加网格线加网格线box off; %加坐标边框加坐标边框axis equal %坐标轴采用等刻度坐标轴采用等刻度2021-11-14212021-11-14222021-11-1423

4、2021-11-14242021-11-1425clf;t=(pi*(0:1000)/1000);y1=sin(t);y2=sin(10*t);y12=sin(t).*sin(10*t);subplot(2,2,1)plot(t,y1);axis(0,pi,-1,1)subplot(2,2,2)plot(t,y2);axis(0,pi,-1,1)%subplot(2,1,2)subplot(position,0.2,0.05,0.6,0.45) %在指定位置上开辟子图，并成为当在指定位置上开辟子图，并成为当前图前图left,bottom,width,heightplot(t,y12,b-,t,

5、y1,-y1,r:);axis(0,pi,-1,1);2021-11-14262021-11-1427x=0 2 5 7 10 12 15 17 20 21;y=0.1 0.2 0.5 0.6 0.9 1 1.2 1.26 1.22 1.2;subplot(2,2,1),plot(x,y);subplot(2,2,2),semilogx(x,y);subplot(2,2,3),semilogy(x,y);subplot(2,2,4),loglog(x,y);2021-11-14282021-11-1429clft=0:pi/50:2*pi;r=sin(t).*cos(t);polar(t,r,

6、-*);2021-11-14302021-11-1431x=0:pi/10:2*pi;y=2*sin(x);subplot(2,2,1);bar(x,y,g);title(bar(x,y,g);axis(0,7,-2,2);subplot(2,2,2);stairs(x,y,b);title(stairs(x,y,b);axis(0,7,-2,2);subplot(2,2,3);stem(x,y,k);title(stem(x,y,k);axis(0,7,-2,2);subplot(2,2,4);fill(x,y,y);title(fill(x,y,y);axis(0,7,-2,2);2021

7、-11-14322021-11-1433clfsubplot(1,2,1);pie(2347,1827,2043,3025);title(饼图饼图);legend(一季度一季度,二季度二季度,三季度三季度,四季度四季度);subplot(1,2,2);compass(7+2.9i,2-3i,-1.5-6i);title(相量图相量图);2021-11-14342021-11-14352021-11-14362021-11-1437clfsubplot(2,2,1);ezplot(x2+y2-9);axis equalsubplot(2,2,2);ezplot(x3+y3-5*x*y+1/5)s

8、ubplot(2,2,3);ezplot(cos(tan(pi*x), 0,1)subplot(2,2,4);ezplot(8*cos(t),4*sqrt(2)*sin(t),0,2*pi)2021-11-14382021-11-14392021-11-14402021-11-14412021-11-14422021-11-14432021-11-14442021-11-14452021-11-1446t=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+si

9、n(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=peaks(30)2021-11-14472021-11-14482021-11-14492021-11-1450clearsubplot(2,2,1);bar3(magic(4)subplot(2,2,2);y=2*sin(0:pi/10:2*pi);stem3(y);subplot(2,2,3);x=2347,1827,20

10、43,3025;explode=0 0 1 0 %pie3(x);pie3(x,explode)subplot(2,2,4);fill3(rand(3,5),rand(3,5),rand(3,5), y )2021-11-14512021-11-1452clearclfsubplot(2,2,1)peaks(50)title(az=-37.5,el=30);subplot(2,2,2)peaks(50)view(90,0)title(az=90,el=0);subplot(2,2,3)peaks(50)view(30,45) title(az=30,el=45);subplot(2,2,4)p

11、eaks(50)view(2) title(az=0,el=90); %二维平面图二维平面图2021-11-14532021-11-14542021-11-14552021-11-14562021-11-14572021-11-14582021-11-1459x,y,z=sphere(20);colormap(copper);subplot(1,3,1);surf(x,y,z);shading faceted title(shading faceted)axis equalsubplot(1,3,2);surf(x,y,z);shading flat; %网格的每个线段和表面都有相同的网格的每

12、个线段和表面都有相同的颜色颜色title(shading flat)axis equalsubplot(1,3,3);surf(x,y,z);shading interp; colormap(hot)title(shading interp)axis equal2021-11-1460透视与消隐透视与消隐 用于网线图用于网线图2021-11-146101020300102030-10-505102021-11-146201020300102030-10-505102021-11-14632021-11-1464函函 数数 名名功功 能能 描描 述述camlight设置并移动关于摄像头的光源设置

13、并移动关于摄像头的光源lightangle在球坐标下设置或定位一个光源在球坐标下设置或定位一个光源light设置光源设置光源lighting选择光源模式选择光源模式material设置图形表面对光照的反映模式设置图形表面对光照的反映模式2021-11-1465clearx,y,z=sphere(20);subplot(1,2,1);surf(x,y,z);axis equal;light(position,0,1,1); %设置光源设置光源shading interp; lighting flathold on;plot3(0,1,1,p);text(0,1,1, light);subplot

14、(1,2,2);surf(x,y,z);axis equal;light(position,1,0,1,style,infinite);material shiny;shading interp;hold on;plot3(1,0,1,p);text(1,0,1, light);2021-11-14662021-11-146702040600204060-10-505102021-11-146802040600204060-10-505102021-11-14692021-11-147001020300102030-10-505102021-11-14712021-11-14725101520253035404551015202530354045 -5.22 -3.89 -2.56 -2.56 -1.23 -1.23 0.0996 0.0996 1.43 1.43 2.76 2.76 2.76 4.09 5.42 6.752021-11-147302040600204060-10-505102021-11-14742021-11-1475z=peaks(30)pcolor(z)2021-11-14762021-11-14772021-11-1