matlab绘图g教学讲解课件.ppt

1、2023-5-1912023-5-1922023-5-1932023-5-1942023-5-1952023-5-1962023-5-1972023-5-1982023-5-1992023-5-19102023-5-19112023-5-19122023-5-19132023-5-1914x=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x1=x(k);%取取y1与与

2、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);2023-5-19152023-5-19162023-5-1917x=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);%加加Y轴说明轴说明text(0.8,1.

3、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2023-5-19182023-5-19192023-5-1920t=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2023-5-19212023-5-19222023-5-19232023-5-19242023-5-1925clf;t=(pi*(0

4、: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,y1,-y1,r:);axis(0,pi,-1,1);2023-5-192

5、62023-5-1927x=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);2023-5-19282023-5-1929clft=0:pi/50:2*pi;r=sin(t).*cos(t);polar(t,r,-*);2023-5-19302023-5-1931x=0:pi/10:2*pi;

6、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);2023-5-19322023-5-1933clfsubplot(1,2,1);pie(234

7、7,1827,2043,3025);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);2023-5-19342023-5-19352023-5-19362023-5-1937clfsubplot(2,2,1);ezplot(x2+y2-9);axis equalsubplot(2,2,2);ezplot(x3+y3-5*x*y+1/5)subplot(2,2,3);ezplot(cos(tan(pi*x),0,1)subplot(2,

8、2,4);ezplot(8*cos(t),4*sqrt(2)*sin(t),0,2*pi)2023-5-19382023-5-19392023-5-19402023-5-19412023-5-19422023-5-19432023-5-19442023-5-19452023-5-1946t=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

9、,y,z=sphere)subplot(2,1,2);x,y,z=peaks(30);%30X30surf(x,y,z);title(x,y,z=peaks(30)2023-5-19472023-5-19482023-5-19492023-5-1950clearsubplot(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=2347,1827,2043,3025;explode=0 0 1 0%pie3(x);pie3(x,explode)subplot(2,2,4);fill

10、3(rand(3,5),rand(3,5),rand(3,5),y)2023-5-19512023-5-1952clearclfsubplot(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)peaks(50)view(2)title(az=0,el=90);%二维平面图二维平面图2023-5-19532023-5-19542023-5

11、-19552023-5-19562023-5-19572023-5-19582023-5-1959x,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 int

12、erp;colormap(hot)title(shading interp)axis equal2023-5-1960透视与消隐透视与消隐 用于网线图用于网线图2023-5-196101020300102030-10-505102023-5-196201020300102030-10-505102023-5-19632023-5-1964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materi

13、al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2023-5-1965clearx,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(1,2,2);surf(x,y,z);axis equal;light(Position,1,0,1,style,infinite);Material shiny;shading i

14、nterp;hold on;plot3(1,0,1,p);text(1,0,1,light);2023-5-19662023-5-196702040600204060-10-505102023-5-196802040600204060-10-505102023-5-19692023-5-197001020300102030-10-505102023-5-19712023-5-19725101520253035404551015202530354045-5.22-3.89-2.56-2.56-1.23-1.23 0.0996 0.0996 1.43 1.43 2.76 2.76 2.76 4.0

15、9 5.42 6.752023-5-197302040600204060-10-505102023-5-19742023-5-1975z=peaks(30)pcolor(z)2023-5-19762023-5-19772023-5-19782023-5-19792023-5-19802023-5-19812023-5-19821.二维图形绘制的一般步骤二维图形绘制的一般步骤2023-5-19832.三维图形绘制的一般步骤三维图形绘制的一般步骤2023-5-19842023-5-19852023-5-19862023-5-19872023-5-19882023-5-19892023-5-19902023-5-19912023-5-19922023-5-1993