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1、绘图指令1二维曲线图1.1绘制折线图plot指令图例Y=[1,3,6,5,9,0,2];plot(Y);X=0:pi/10:pi*2;Y=sin(X);plot(X,Y);X=0:pi/10:pi*2;Y1=sin(X);Y2=cos(X);Plot(X,Y1,X,Y2);调整坐标范围：axisaxis([0,300,0,2])1.2绘制自定义函数DrawCircle.mfunctionDrawCircle(Point,Radius)Holdont=0:pi/10:2*pi;x=Point(1)+Radiu
2、s*cos(t);y=Point(2)+Radius*sin(t);plot(x,y);DrawCircle([1010],1)DrawCircle([2010],2)DrawCircle([1020],3)1.3绘制符号函数显函数ezplot('sin(x)',[0,2*pi])隐函数ezplot('x^2+y^2-10',[-5,5],[-6,6])参数方程ezplot('cos(t)^3','sin(t)^3',[0,2*pi])1.4绘制自定义函数functiony=myf1(x)y=sqrt(10
3、0-x^2);fplot('myf1',[-1515])fplot('[sin(x)cos(x)myf1(x)]',[-1515])1.5图形修饰设置颜色ymcrgbwk设置线型-:-.--设置标记.ox+*指令图例Y=[1,3,6,5,9,0,2];plot(Y,'r-+');X=0:pi/10:pi*2;Y=sin(X);plot(X,Y,'b-.');X=0:pi/10:pi*2;Y1=sin(X);Y2=cos(X);plot(X,Y1,'r+-',X,Y2,'b-*');在指定坐标处，书写文字：t
4、ext(3.5,0.6,'曲线比较');x=[1.6*pi,1.6*pi];y=[-0.3,0.8];s=['曲线cos';'曲线sin'];text(x,y,s);1.6更多类型的二维图指令图例bar直方图X=0:pi/10:2*pi;Y=sin(X);bar(X,Y);polar极坐标图T=0:pi/10:4*pi;R=T;polar(T,R);误差棒棒图X=0:pi/10:2*pi;Y=sin(X);e=0.2*rand(size(X));errorbar(X,Y,e);火柴杆图X=0:pi/10:2
5、*pi;Y=sin(X);stem(X,Y);stairs楼梯图X=0:pi/10:2*pi;Y=sin(X);stairs(X,Y);多边形填色图X=[1,2,3,4,5];Y=[3,5,2,1,6];fill(X,Y,'r');holdon;%保持图形plot(X,Y,'o')1.7数值函数的二维图可用于绘图，更可用于采样取点。fplot('0.5*cos(x)',[-pi,pi])%绘图[X,Y]=fplot('0.5*cos(x)',[-pi,pi]);%返回点坐标fplot('cos(x)',[-
6、pi,pi],'r-+');%观察点的位置控制采样点的密度fplot('cos(x)',[-pi,pi],'r-+',0.05);fplot('cos(x)',[-pi,pi],'r-+',0.1);可绘制系统函数，也可绘制自定义函数的图形。2三维曲线图2.1三维曲线plot3指令图例X=0:0.1:8*pi;Y=sin(X);Z=cos(X);plot3(X,Y,Z,'r');X=0:0.1:8*pi;Y=sin(X);Z1=cos(X);Z2=2*cos(X);plot3(X,Y,Z1,'r',X,Y,
7、Z2,'b');2.2三维面填色fill3指令图例X1=[2,2,1];Y1=[0,2,1];Z1=[0,0,1];fill3(X1,Y1,Z1,'r');holdon;X2=[1,0,0];Y2=[1,2,0];Z2=[1,0,0];fill3(X2,Y2,Z2,'r');X3=[0,2,1];Y3=[2,2,1];Z3=[0,0,1];fill3(X3,Y3,Z3,'b');text(1,1,1,'1,1,1');3曲面图形3.1网格点坐标的表示x=1:2:7y=2:2:6[X,Y]=meshgrid(
8、x,y)X=135713571357Y=2222444466663.2三维网格mesh、meshc、meshz用途：数据场的观察分析命令图例随机数据的网格Z=rand(5,5);mesh(Z);%设置颜色colormap([1,0,0]);自定义函数的网格x=[-4:1:4];y=[-5:1:5];[X,Y]=meshgrid(x,y);Z=X.^2+Y.^2;mesh(X,Y,Z);消影开关：hiddenon/
