用plot函数绘制正弦曲线和余弦曲线

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1、用plot函数绘制正弦曲线和余弦曲线>>x=0:0.1*pi:2*pi;>>y1=sin(x);>>y2=cos(x);>>plot(x,y1,'-.',x,y2,'s',x,y2);10.80.60.40.20-0.2-0.4-0.6-0.8-101234567>>x=-40:40;>>y=(1/2.498*10)*exp((-x.^2)/(2*10^2));>>plot(x,y);>>title('alpha=0,sigma=10的正态分布曲线');>>xlabel('x');ylabel('概率密度f(x)');>>=0,=10的正态分布曲线4.543.53f(x2.5)2

2、概率1.5密度10.50-40-30-20-10010203040x1>>x=-pi:.01:pi;>>y1=sin(x);y2=cos(x);>>plot(x,y1,'r-',x,y2,'o');10.80.60.40.20-0.2-0.4-0.6-0.8-1-4-3-2-101234绘制正弦曲线和余弦曲线>>x=-pi:.01:pi;>>y1=sin(x);y2=cos(x);>>plot(x,y1,'r-',x,y2,'o');>>legend('y=sin(x)','y=cos(x)');1y=sin(x)0.8y=cos(x)0.60.40.20-0.2-0.4-0.6-0.8

3、-1-4-3-2-1012342用text函数标出log函数的零点>>x=-2:.1:2;>>y=x.^2+2*x-3;>>plot(x,y);>>text(1,0,'leftarrow零点');543210零点-1-2-3-4-2-1.5-1-0.500.511.52绘制正弦余弦和正切曲线>>x=0:.1:3*pi;>>y1=sin(x);>>y2=cos(x);>>y3=tan(x+eps);>>subplot(2,2,1:2);plot(x,y1);>>subplot(2,2,3);plot(x,y1);>>subplot(2,2,4);plot(x,y3);10.50-0.5

4、-101234567891011000.55000-0.5-1-50051005103为坐标轴添加细网格>>t=0:.02:2*pi;>>plot(cos(t),sin(t));>>axisequal;>>gridminor;0.80.60.40.20-0.2-0.4-0.6-0.8-1-0.500.51创建两个图形窗口并画图>a=figurea=1>>x=1:10;y=x;>>plot(x,y);>>b=figureb=2>>plot(x,y.^2);>>figure(a);gridon;4109876543211234567891010090807060504030201001234

5、56789105在同一窗口绘制正弦和余弦曲线>>x=0:.02:2*pi;>>y1=sin(x);>>y2=cos(x);>>plot(x,y1);>>holdon;plot(x,y2);10.80.60.40.20-0.2-0.4-0.6-0.8-101234567>>hmp=@humps;>>subplot(2,1,1);fplot(hmp,[0,1]);>>sn=@(x)sin(1./x);>>subplot(2,1,2);fplot(sn,[.01,.1]);10080604020000.10.20.30.40.50.60.70.80.9110.50-0.5-10.010.020

6、.030.040.050.060.070.080.090.16绘制指数函数的爽对数坐标图>>x=logspace(-1,2);>>loglog(x,exp(x),'-s');gridon;50104010301020101010010-101210101010用两种方法绘制以10为底的对数函数>>x=0:.1:5;>>subplot(2,1,1);plot(x,log10(x));subplot(2,1,2);semilogx(x,log10(x));10.50-0.5-100.511.522.533.544.5510.50-0.5-1-1011010107绘制极坐标图>>t=0:.01

7、:2*pi;>>y=sin(5*t);>>polar(t,y);901120600.80.6150300.40.21800210330240300270>>t=0:.01:2*pi;>>y=sin(9*t);>>polar(t,y);901120600.80.6150300.40.218002103302403002708a=round(rand(4,2)*10);>>subplot(2,2,1);bar(a,'grouped');