用plot函数绘制正弦曲线和余弦曲线

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);01234567-1-0.8-0.6-0.4-0.200.20.40.60.81>> 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)'); >> -40-30-20-1001020304000.511.522.533.544.5=0,=10分 分 分 分 分 分 分x分 分 分 分 f(x)2>> x=-pi:.01:pi; >> y1=sin(x);y2=cos(x); >> plot(x,y1,'r-',x,y2,'o');-4-3-2-101234-1-0.8-0.6-0.4-0.200.20.40.60.81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)');-4-3-2-101234-1-0.8-0.6-0.4-0.200.20.40.60.81y=sin(x) y=cos(x)3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');-2-1.5-1-0.500.511.52-4-3-2-1012345分 分绘制正弦 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);012345678910-1-0.500.510510-1-0.500.510510-500501004为坐标轴添加细网格>> t=0:.02:2*pi; >> plot(cos(t),sin(t)); >> axis equal; >> grid minor;-1-0.500.51-0.8-0.6-0.4-0.200.20.40.60.8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;512345678910123456789101234567891001020304050607080901006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);01234567-1-0.8-0.6-0.4-0.200.20.40.60.81>> hmp=@humps; >> subplot(2,1,1);fplot(hmp,[0,1]); >> sn=@(x) sin(1./x); >> subplot(2,1,2);fplot(sn,[.01,.1]);00.10.20.30.40.50.60.70.80.910204060801000.010.020.030.040.050.060.070.080.090.1-1-0.500.517绘制指数函数的爽对数坐标图>> x=logspace(-1,2); >> loglog(x,exp(x),'-s');grid on;10-110010110210010101020103010401050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));00.511.522.533.544.55-1-0.500.5110-1100101-1-0.500.518绘制极坐标图 >> t=0:.01:2*pi; >> y=sin(5*t); >> polar(t,y);0.20.40.60.813021060240902701203001503301800>> t=0:.01:2*pi; >> y=sin(9*t); >> polar(t,y);0.20.40.60.8130210602409027012030015033018009a=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');12340510grouped1234051015stacked0510151234stacked1234051010> 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');12340510grouped1234051015stacked0510151234stacked12340510width=1.511绘制正弦函数的阶梯图 >> x=-2*pi:.3:2*pi; >> stairs(x,sin(x));-8-6-4-202468-1-0.8-0.6-0.4-0.200.20.40.60.81隐函数绘制曲线 >> colormap([0,0,1]);设置线条颜色 >> subplot(2,2,1); >> ezplot('x^2+y^2/3-9');绘制椭圆 >> subplot(2,2,2); >> ezplot('x^2+y/3-2');绘制抛物线 >> subplot(2,2,3); >> ezplot('x^2-y/3-3');绘制双曲线 >> subplot(2,2,4); >> ezplot('cos(t)','sin(t)^2');-505-505xyx2+y2/3-9 = 0-505-505xyx2+y/3-2 = 0-505-505xyx2-y/3-3 = 0-0.500.5100.51xyx = cos(t), y = sin(t)212填充一个六边形 >> t=(0:1/6:1)*2*pi; >> x=cos(t); >> y=sin(t); >> fill(x,y,'m');-1-0.8-0.6-0.4-0.200.20.40.60.81-1-0.8-0.6-0.4-0.200.20.40.60.81在 x 轴上放大正弦曲线 >> x=1:.2:10; >> y=sin(x); >> plot(x,y); >> zoom xon;12345678910-1-0.8-0.6-0.4-0.200.20.40.60.8113绘制复数的箭头图 > Z=eig(randn(10,10))Z =2.7037 2.1703 + 1.3780i2.1703 - 1.3780i1.6533 -2.4172 -0.6656 + 1.4599i-0.6656 - 1.4599i-1.2391 + 0.3929i-1.2391 - 0.3929i-0.3378 >> compass(Z)123302106024090270120300150330180014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0510152025010020030040050060015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);02468101214161820-2-1.5-1-0.500.511.52绘制正态分布数据的直方图 >> x=-4:.1:4; >> y=randn(10000,1); >> hist(y,x);-5-4-3-2-101234505010015020025030035040045016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102030403021060240902701203001503301800绘制向量 0:99 的傅里叶变换的离散数据图 >> a=linspace(0,99); 0 到 99，长度为 100 的等分向量 >> b=fft(a); 去傅里叶变换 >> stem(abs(b)) 绘制傅里叶变换的离散数据图0102030405060708090100050010001500200025003000350040004500500017绘制简单的三维饼形图 >> x=linspace(0,1,10); >> y=x/2; >> z=sin(x)+cos(y); >> stem3(x,y,z);>> 00.20.40.60.8100.20.40.60.800.511.52。