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%用plot3三维曲线绘图 x=0:0.1:20*pi; plot3(x,sin(x),cos(x)) %按系统默认设置绘图

%在图形中用ginput将点的坐标取出，并用gtext写字符串 x=0:0.1:2*pi; plot(x,sin(x)) [m,n]=ginput(2) %取两点坐标 gtext('2\pi') %写2π

%在图形窗口中添加文字标注 x=0:0.1:2*pi; plot(x,sin(x)) hold on plot(x,cos(x),'ro') title('y1=sin(x),y2=cos(x)') %添加标题 xlabel('x') %添加横坐标名 legend('sin(x)','cos(x)',4) %添加图例 text(pi,sin(pi),'x=\p

%使用几种命令绘制离散数据 x=0:0.1:2*pi; y=sin(x).*exp(-2*x); subplot(3,1,1) stem(x,y,'filled') %画火柴杆图 subplot(3,1,2) stairs(x,y) %画阶梯图 subplot(3,1,3) scatter(x,y) %画点图

%求符号表达式的积分 f=sym('cos(x)'); int(f) %求不定积分 int(f,0,pi/3) %求定积分 int(f,'a','b') %求定积分 int(int(f)) %求多重积分 syms t x g=[2*x t^2;t*sin(x) exp(x)] %创建符号矩阵 int(g) %对x求不定积分 int(g,'t') %对t求不定积分

x=linspace(0,2*pi,60); y=sin(x); hf=figure('Color',[0,1,0],'Position',[0,0,450,250],... 'Name','我的图形窗口','NumberTitle','off','MenuBar','none',... 'KeyPressFcn', 'plot(x,y);axis([0

t=0:pi/20:2*pi; y1=sin(t); y2=cos(t); figh=figure('Position',[30,100,800,350]); axes('GridLineStyle','-.','XLim',[0,2*pi],'YLim',[-1,1]); line('XData',t,'YData',y1,'LineWidth',2); line(t,y2); g

clf; %清除图形窗口中的内容 x=linspace(0,2*pi,20); y=sin(x); axes('Position',[0.2,0.2,0.2,0.7],'GridLineStyle','-.'); plot(y,x); grid on axes('Position',[0.4,0.2,0.5,0.5]); t=0:pi/1

x=linspace(0,2*pi,60); y=sin(x); hf=figure('Color',[0,1,0],'Position',[1,1,450,250],... 'Name','我的图形窗口','NumberTitle','off','MenuBar','none',... 'KeyPressFcn', 'plot(x,y);axis([0

x=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)