第07章.zip

x=0:0.01:pi; y1=sin(x); y2=2*sin(x); y3=3*sin(x); plot(x,y1,':') hold on; plot(x,y2,'--') hold on plot(x,y3,'p') plot(x,y1,'-',x,y2,'x',x,y3,'o'); %%颜色控制 plot(x,y1,'r'); plot(x,y2,'b'); plot(x,y3,'k'); plot(x,y1,'r',x,y2,'b',x,y3,'k') %%线宽控制 plot(x,y1); plot(x,y2,'LineWidth',2) plot(x,y3,'LineWidth',4) plot(x,y1,'LineWidth',1);hold on; plot(x,y2,'LineWidth',2);hold on; plot(x,y3,'LineWidth',4);hold on; set(0,'DefaultAxesLineStyleOrder','--') plot(x,y1) %%实例 x=0:0.01:4*pi; y1=exp(-x/3).*sin(3*x); y2=exp(-x/3); y3=-exp(-x/3); plot(x,y1,'LineWidth',3); hold on; plot(x,y2,'--r','LineWidth',2); hold on; plot(x,y3,'-.m','LineWidth',1); %%子图的绘制 x=0:0.01:pi/2; y1=sin(x); y2=cos(x); y3=tan(x); y4=cot(x); subplot(2,2,1); plot(x,y1); subplot(2,2,2); plot(x,y2); subplot(2,2,3); plot(x,y3); subplot(2,2,4); plot(x,y4); %%双y轴图形的绘制 x=0:0.01:20; y1=100*exp(-0.05*x).*sin(x); y2=exp(-0.5*x).*sin(10*x); plot(x,y1,x,y2); %%普通重叠图 hold on; plotyy(x,y1,x,y2); %%双y轴图 %%绘图网格 x=-pi:0.01:pi; y=sin(x); plot(x,y); grid on x=-pi:0.01:pi; y=sin(x); grid on; hold on; plot(x,y) %%坐标轴的显示 x=-pi:0.01:pi; y=sin(x); plot(x,y); box off %%绘制二维图形范围 x=0:0.01:pi/2; y=tan(x); plot(x,y) axis([0 pi/2 0 10]) %%坐标轴控制 x=-pi:0.01:pi; y1=sin(x); y2=2*cos(x); plot(x,y1); axis manual hold on; plot(x,y2,'LineWidth',3); %%输入一个参数绘制图形 %标准 t=0:0.01:2*pi; x=sin(t); y=cos(t); plot(x,y); %方形参数坐标轴 t=0:0.01:2*pi; x=sin(t); y=cos(t); plot(x,y); axis square %等刻度坐标轴 t=0:0.01:2*pi; x=sin(t); y=cos(t); plot(x,y); axis equal %%坐标轴标准 x=0:0.01:2*pi; y=sin(x); plot(x,y); xlabel('x(0-pi/2)/\alpha'); ylabel('y=sin(x)'); title('正弦函数'); %%文本标注 x=0:0.01:2*pi; y=sin(x); plot(x,y); text(pi,0,'x=pi,y=0'); hold on; plot(pi,0,'*') gtext('正弦曲线') %%图例标注 x=-pi:0.01:pi; y=sin(x); y1=cos(x); plot(x,y,'-ro',x,y1,'-.b'); legend('sin','cos',1); %%双y轴图标注 x=0:0.01:20; y1=100*exp(-0.05*x).*sin(x); y2=exp(-0.5*x).*sin(10*x); [ax,h1,h2]=plotyy(x,y1,x,y2); xlabel('x(0~20)'); ylabel('left yaxis'); axes(ax(2)); ylabel('right yaxis'); set(h1,'linestyle','--'); title('双y轴图') %%实例 x1=-pi:0.01:pi; x2=-pi:0.01:pi; y1=sin(x1)+sin(2*x1)-cos(3*x1); y2=2*sin(x2); h1=plot(x1,y1) hold on; h2=plot(x2,y2); xlabel('x(-pi~pi)'); ylabel('y'); title('曲线图') legend('y1=sin(x1)+sin(2*x1)-cos(3*x1)','y2=2*sin(x)',2); %%交互式命令进行绘制曲线 axis([0 15 0 15]); grid on; hold on; title('通过点击鼠标选取点'); xy=[]; n=0; disp('提示：单击左键选择点，单击右键结束选择'); but=1; while but==1 [xi,yi,but]=ginput(1); plot(xi,yi,'bp'); n=n+1; xy(:,n)=[xi;yi]; end t=1:n; ts=1:0.1:n; xys=spline(t,xy,ts); plot(xys(1,:),xys(2,:),'r-','LineWidth',2); hold off %%函数绘图 easy 绘图命令 subplot(2,1,1); fplot(@humps,[-0.5,3]); title('figure 1：humps'); grid on; subplot(2,1,2); f_h=@(x) sin(x)/x; fplot(f_h,[-10,10]); title('figure 2 sin(x)/x'); grid on; syms t y=exp(-2*t/3)*sin(1+2*t); ezplot(y,[pi,3*pi]); grid on; ezpolar('1+cos(t)');