matlab函数图像画图教程

Matlab画图教程1、MATLAB简介：MATLAB语言丰富的图形表现方法，使得数学计算结果可以方便地、多样性地实现了可视化，这是其它语言所不能比拟的。2、MATLAB的绘图功能：单窗口单曲线绘图x=[0,0.58,0.84,1,0.91,0.6,0.14]plot(x)单窗口多曲线绘图t=0:pi/100:2*pi;y=sin(t);y1=sin(t+0.25);y2=sin(t+0.5);plot(t,y,t,y1,t,y2)单窗口多曲线分图绘图t=0:pi/100:2*pi;y=sin(t);y1=sin(t+0.25);y2=sin(t+0.5);plot(t,y,t,y1,t,y2)subplot(1,3,1);plot(t,y)subplot(1,3,2);plot(t,y1)subplot(1,3,3);plot(t,y2)t=0:pi/100:2*pi;y=sin(t);y1=sin(t+0.25);y2=sin(t+0.5);plot(t,y,t,y1,t,y2)subplot(3,1,1);plot(t,y)subplot(3,1,2);plot(t,y1)subplot(3,1,3);plot(t,y2)多窗口绘图t=0:pi/100:2*pi;y=sin(t);y1=sin(t+0.25);y2=sin(t+0.5);plot(t,y)figure(2)plot(t,y1)figure(3)plot(t,y2)可任意设置颜色与线型t=0:pi/100:2*pi;y=sin(t);y1=sin(t+0.25);y2=sin(t+0.5);subplot(1,3,1);plot(t,y,'r-')subplot(1,3,2);plot(t,y1,'g:')subplot(1,3,3);plot(t,y2,'b*')图形加注功能t=0:0.1:10y1=sin(t);y2=cos(t);plot(t,y1,'r',t,y2,'b--');x=[1.7*pi;1.6*pi];y=[-0.3;0.8];s=['sin(t)';'cos(t)'];text(x,y,s);title('正弦和余弦曲线');legend('正弦','余弦')xlabel('时间t'),ylabel('正弦、余弦')gridaxissquarefill-基本二维绘图函数x=[12345];y=[4151fill(x,y,'r')绘制阶梯曲线x=0:pi/20:2*pi;y=sin(x);stairs(x,y)绘制极坐标绘图t=0:2*pi/90:2*pi;y=cos(4*t);polar(t,y)绘制火柴杆绘图t=0:0.2:2*pi;y=cos(t);stem(y)绘制直方图t=0:0.2:2*pi;y=cos(t);bar(y)绘制彗星曲线图t=-pi:pi/500:pi;y=tan(sin(t))-sin(tan(t));comet(t,y)绘制三维线形图t=0:pi/50:10*pi;plot3(t,sin(t),cos(t),'r:')三维多边形y1=rand(3,5);y2=rand(3,5);y3=rand(3,5);fill3(y1,y2,y3,'m');holdon;plot3(y1,y2,y3,'yo')矩阵的三维网线图z=rand(6);0.8808 0.0729 0.4168 0.7694 0.3775 0.47760.33810.71010.33810.71010.09640.63520.38260.70860.18950.87910.67470.89650.68760.23800.74310.35940.56260.87840.12170.39100.71890.08990.81300.48650.07680.97590.87920.16100.87820.11310.14330.6288=round(z)1 0 0 1 0 0010101011110101100101001101001mesh(z)；不出图…meshgrid——网线坐标值计算函数x=-5:5;y=x;[X,Y]=meshgrid(x,y)Z=X.^2+Y.^2mesh(X,Y,Z)三维曲面图x=-5:5;y=x;[X,Y]=meshgrid(x,y)Z=X.^2+Y.^2surf(X,Y,Z)1(1)在同一幅图上的区间，用0.5的间隔绘制sinx的红色曲线，用0.1隔绘制sin(x+0.5)0.01的间隔绘制sin(x+1)的蓝色曲线。t=-pi:0.5:pi;y=sin(t);t=-pi:0.1:pi;y1=sin(t+0.5);t=-pi:0.01:pi;y2=sin(t+1);plot(t,y,'r-',t,y1,'g:',t,y2,'b*')(2)给图的x和y轴添加标注。xlabel('时间t'),ylabel('正弦')2在[-2*pi,pi]0.15cos(x.^2+1)t=--10:0.1:10;y=5*cos(x..*x+1);plot(x,y,'r');x=[-2*pi;pi];3编辑M曲面图，并对它们分别加图题和标注坐标轴。x=-2:0.05:2;y=-2:0.05:2;[X,Y]=meshgrid(x,y);Z=4*X.*(exp(-(X.^2+Y.^2)));figure(1);plot3(X,Y,Z);gridon;隶书figure(2);mesh(X,Y,Z);gridon;title('三维网眼图','FontSize',24,'FontName','隶书');figure(3);surf(X,Y,Z);gridon;title('三维表面图','FontSize',24,'FontName','隶书');四、作业：

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(x2y2)编辑M文件实现函数 的各种图形包括三维线形图网眼图表面图、轮廓图、混合图，并对它们分别加图题和标注坐标轴。x=-2:0.05:2;y=-2:0.05:2;[X,Y]=meshgrid(x,y);Z=4*X.*(exp(-(X.^2+Y.^2)));figure(1);plot3(X,Y,Z);gridon;title('三维线形图','FontSize',24,'FontName','隶书');xlabel('时间t'),ylabel('对数');figure(2);mesh(X,Y,Z);gridon;隶书xlabel('t'),ylabel('对数');on;title('三维表面图','FontSize',24,'FontName','隶书');xlabel('时间t'),ylabel('对数');figure(4);contour(X,Y,Z);gridon;title('三维轮廓图','FontSize',24,'Fo