用plot函数绘制正弦曲线和余弦曲线.doc

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); x=-40:40; y=(1/2.498*10)*exp(-x.2)/(2*102); plot(x,y); title(alpha=0,sigma=10的正态分布曲线); xlabel(x);ylabel(概率密度f(x); x=-pi:.01:pi; y1=sin(x);y2=cos(x); plot(x,y1,r-,x,y2,o);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);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);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);为坐标轴添加细网格 t=0:.02:2*pi; plot(cos(t),sin(t); axis equal; grid minor;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);grid on;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); hold on;plot(x,y2); hmp=humps; subplot(2,1,1);fplot(hmp,0,1); sn=(x) sin(1./x); subplot(2,1,2);fplot(sn,.01,.1);绘制指数函数的爽对数坐标图 x=logspace(-1,2); loglog(x,exp(x),-s);grid on;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);绘制极坐标图 t=0:.01:2*pi; y=sin(5*t); polar(t,y); t=0:.01:2*pi; y=sin(9*t); polar(t,y);a=round(rand(4,2)*10); subplot(2,2,1);bar(a,grouped); title(grouped); subplot(2,2,2);bar(a,stacked); title(stacked); subplot(2,2,3);barh(a,stacked); title(stacked); subplot(2,2,4);bar(a,1.5); a=round(rand(4,2)*10); subplot(2,2,1);bar(a,grouped); title(grouped); subplot(2,2,2);bar(a,stacked); title(stacked); subplot(2,2,3);barh(a,stacked); title(stacked); subplot(2,2,4);bar(a,1.5); title(width=1.5);绘制正弦函数的阶梯图 x=-2*pi:.3:2*pi; stairs(x,sin(x);隐函数绘制曲线 colormap(0,0,1);设置线条颜色 subplot(2,2,1); ezplot(x2+y2/3-9);绘制椭圆 subplot(2,2,2); ezplot(x2+y/3-2);绘制抛物线 subplot(2,2,3); ezplot(x2-y/3-3);绘制双曲线 subplot(2,2,4); ezplot(cos(t),sin(t)2);填充一个六边形 t=(0:1/6:1)*2*pi; x=cos(t); y=sin(t); fill(x,y,m);在x轴上放大正弦曲线 x=1:.2:10; y=sin(x); plot(x,y); zoom xon;绘制复数的箭头图 Z=eig(randn(10,10)Z = 2.7037 2.1703 + 1.3780i 2.1703 - 1.3780i 1.6533 -2.4172 -0.6656 + 1.4599i -0.6656 - 1.4599i -1.2391 + 0.3929i -1.2391 - 0.3929i -0.3378 compass(Z)绘制一个简单的彗星图 t=0:.01:2*pi; x=cos(2*t).*(cos(t).2); y=sin(2*t).*(sin(t).2); comet(x,y);绘制误差棒图 load count.dat 载入matlab系统中自带的数据 s=sum(count,2); 计算总和 stda=std(count,0,2); 计算标准差 errorbar(s,stda); 画出每个位置的标准差绘制角度均匀变化的向量 theta=(-90:10:90)*pi/180; r=2*ones(size(theta); u,v=pol2cart(theta,r); feather(u,v);绘制正态分布数据的直方图 x=-4:.1:4; y=randn(10000,1); hist(y,x);绘制matlab自带数据的角度直方图 figure; load sunspot.dat 载入数据 rose(sunspot(:,2),12) 分为12组绘制角度直方图绘制向量0:99的傅里叶变换的离散数据图 a=linspace(0,99)