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1、1题x=linspace(0,2*pi,101);y=(0.5+(3*sin(x)/(1+x.2)*cos(x);plot(x,y)2题x=linspace(0,2*pi,100);y1=x.2;y2=cos(2*x);y3=y1.*y2;subplot(2,2,1);plot(x,y1,g,x,y2,r,x,y3,c)title(第（1）小题不同颜色绘图)subplot(2,2,2);plot(x,y1);title(第（2）小题（ 子图1）)subplot(2,2,3);plot(x,y2);title(（子图2）)subplot(2,2,4);plot(x,y3);title(（子图3）
2、)figure(2)subplot(4,4,1);bar(x,y1);title(y1条形图);subplot(3,4,2);stem(x,y1);title(y1杆图);subplot(3,4,3);stairs(x,y1);title(y1阶梯图);subplot(3,4,4);fill(x,y1,g);title(y1填充图);subplot(3,4,5);bar(x,y2);title(y2条形图);subplot(3,4,6);stem(x,y2);title(y2杆图);subplot(3,4,7);stairs(x,y2);title(y2阶梯图);subplot(3,4,8);
3、fill(x,y2,g);title(y2填充图);subplot(3,4,9);bar(x,y3);title(y3条形图);subplot(3,4,10);stem(x,y3);title(y3杆图);subplot(3,4,11);stairs(x,y3);title(y3阶梯图);subplot(3,4,12);fill(x,y3,g);title(y3填充图);3题x1=linspace(-5,0,50);x2=linspace(0,5,50);y1=(x1+sqrt(pi)/exp(2);y2=1/2*log(x2+sqrt(1+x2.2);plotyy(x1,y1,x2,y2)g
4、rid on4题theta=0:0.01:2*pi;c=1;for(a=4:5) for(b=2:3) for(n=3:4) rho=a*sin(b+n*theta); subplot(2,4,c) polar(theta,rho,g) c=c+1; end endend由图片分析得：a影响曲线的半径，b影响曲线的角度，n影响曲线的周期5题x=linspace(-5,5,31);y=linspace(0,10,21);x,y=meshgrid(x,y)a=sqrt(x.2+y.2);z=cos(x).*cos(y).*exp(-a/4);subplot(1,2,1);surf(x,y,z);shading interpview(-27.5,30)subplot(1,2,2);contour3(x,y,z,50,g)6题s=linspace(0,pi/2,100);t=linspace(0,pi*3/2,100);s,t=meshgrid(s,t)x=cos(s).*cos(t);y=cos(s).*sin(t);z=sin(s);surf(x,y,z)shading interp;
