matlab二维数据可视化.

1、二维数据可视化 4 MATLAB绘图原理 MATLAB根据给出的采样点，自动地进行插值计算，进而绘制出曲线。 只是真实曲线的近似。采样点不够多时，不能真实反映原函数。 clc;clear all; x1=0:pi/10:pi; x2=0:pi/100:pi; y1=sin(x1).*sin(9*x1); y2=sin(x2).*sin(9*x2); subplot(2,1,1),plot(x1,y1) axis(0,pi,-1,1),title(a)y=sin(x)sin(9x)的图形,采样点较少,11个点) subplot(2,1,2),plot(x2,y2) axis(0,pi,-1,1)

2、,title(b)y=sin(x)sin(9x)的图形,采样点较多,101个点) 4 plot(x,y) clc;clear all; x=0.01:0.3:2*pi; y=cos(x+0.5)+2; plot(x,y) clc;clear all; x=0:0.1:6; y=sin(x); plot(x,y) plot(x,y,s) 线型 -实线(默认) -虚线 :点线 -.点划线等等 采样点 +加号 o空心圆 *星号 s正方形 h六边形等等 颜色 r红色 g绿色 b蓝色 k黑色等等 clc;clear all; x=0:0.1:6; y=sin(x); plot(x,y,-og*) clc

3、;clear all; x=0:0.1:6; y=sin(x); plot(x,y) plot(x,y,s) 线型 -实线(默认) -虚线 :点线 -.点划线等等 采样点 +加号 o空心圆 *星号 s正方形 h六边形 d菱形等等 颜色 r红色 g绿色 b蓝色 k黑色等等 clc;clear all; x=0.01:0.3:2*pi; y=cos(x+0.5)+2; plot(x,y,r-.*) clc;clear all; x=0.01:0.3:2*pi; y=cos(x+0.5)+2; plot(x,y) 生成子图subplot clc;clear all; x=0:0.1:6; y=sin

4、(x); subplot(2,1,1) plot(x,y) subplot(2,1,2) plot(x,y,-og) clc;clear all; x=0.01:0.3:2*pi; y=cos(x+0.5)+2; subplot(2,1,1) plot(x,y) subplot(2,1,2) plot(x,y,r-.*) 生成子图subplot plot(x,y,s) LineWidth 线宽 MarkerEdgeColor 采样点边框的颜色 MarkerEdgeColor 采样点内部填充颜色 MarkerSize 采样点大小 clc;clear all; x=-pi:pi/10:pi; y=

5、tan(sin(x)-sin(tan(x); plot(x,y,-rs,. LineWidth,2,. MarkerEdgeColor,k,. MarkerFaceColor,g,. MarkerSize,10) %-虚线 s正方形 r红色 k黑色 g绿色 clc;clear all; x=-pi:pi/10:pi; y=tan(sin(x)-sin(tan(x); plot(x,y,-rs) 4 开启网格grid on grid off clc;clear all; x=0.01:0.01:2*pi; y=sin(x); plot(x,y) grid on clc;clear all; x=

6、0.01:0.01:2*pi; y=sin(x); plot(x,y) grid off clc;clear all; x=0.01:0.01:2*pi; y=sin(x); plot(x,y) %默认为不画网格线 4 关闭边框box off box on clc;clear all; x=0.01:0.01:2*pi; y=sin(x); plot(x,y) box off clc;clear all; x=0.01:0.01:2*pi; y=sin(x); plot(x,y) box on clc;clear all; x=0.01:0.01:2*pi; y=sin(x); plot(x,

7、y) %默认为边框开启 图像标注title xlabel ylabel legend text clc;clear all; x=0:pi/10:2*pi; y=sin(x); plot(x,y,-rs) title(函数图像) xlabel(x轴) ylabel(y轴) legend(sin(x) text(0.8*pi,sin(3*pi/4),leftarrow y=sin(x) 坐标轴设置axis clc;clear all; x=0:pi/10:2*pi; y=sin(x); plot(x,y,-rs) title(函数图像) xlabel(x轴) ylabel(y轴) legend(

8、sin(x) text(0.8*pi,sin(3*pi/4),leftarrow y=sin(x) axis equal 坐标轴设置set clc;clear all; x=0:pi/10:2*pi; y=sin(x); plot(x,y,-rs) title(函数图像) xlabel(x轴) ylabel(y轴) legend(sin(x) text(0.8*pi,sin(3*pi/4),leftarrow y=sin(x) set(gca,Xtick,-pi:pi/2:2*pi) set(gca,Ytick,-1:0.5:1) set(gca,XtickLabel,-pi,-pi/2,0,

9、pi/2,pi) 4 plot(x,y1,s1,x,y2,s2) clc;clear all; x=-pi:pi/10:pi; y1=sin(x); y2=cos(x); plot(x,y1,r:*,x,y2,g-.v) set(gca,Xtick,-pi:pi/2:pi) set(gca,XtickLabel,-pi,-pi/2,0,pi/2,pi) legend(sin(x),cos(x) 4 plot(x,y1,s1,x,y2,s2,x,y3,s3) clc;clear all; x=-pi:pi/10:pi; y1=sin(x+2); y2=cos(x-1); y3=sin(x).*c

10、os(x); plot(x,y1,r:*,x,y2,g-.v,x,y3,k-s) set(gca,Xtick,-pi:pi/2:pi) set(gca,XtickLabel,-pi,-pi/2,0,pi/2,pi) set(gca,Ytick,-1:0.5:1) legend(sin(x+2),cos(x-1),sin(x)cos(x) 4 plot(x1,y1,s1,x2,y2,s2) clc;clear all; x1=-pi:pi/10:pi; y1=sin(x1); x2=0:pi/10:2*pi; y2=cos(x2); plot(x1,y1,r:*,x2,y2,g-.v) set(

11、gca,Xtick,-pi:pi/2:2*pi) set(gca,XtickLabel,-pi,-pi/2,0,pi/2,pi,3pi/2,2pi) set(gca,Ytick,-1:0.5:1) text(-pi+0.3,0,leftarrow y=sin(x) text(3*pi/2+0.3,0,leftarrow y=cos(x) 4 plot(x1,y1,s1,x2,y2,s2,x3,y3,s3) clc;clear all; x1=-pi:pi/10:pi; y1=sin(x1); x2=-1:1/10:1; y2=asin(x2); x3=-2:1:2; y3=x3; plot(x

12、1,y1,x2,y2,x3,y3) legend(sin(x),asin(x),x) 4 开启叠加图hold on hold off clc;clear all; x=-pi:pi/10:pi; plot(x,sin(x),r:) hold on plot(x,cos(x),b-) plot(x,cos(x),b-) hold off plot(x,cos(x),b-) %默认为叠加关闭 4 fplot(fun,lims,tol) clc;clear all; x=0:0.01:1; y=cos(tan(pi*x); subplot(1,2,1); plot(x,y,-b); title(采用

13、函数plot绘图); subplot(1,2,2); fplot(cos(tan(pi*x),0 1,1e-4); title(采用函数fplot绘图); 4 ezplot(fun,xmin,xmax) clc;clear all; subplot(2,1,1) ezplot(sin(x) subplot(2,1,2) ezplot(sin(x),-2*pi,2*pi) 4 ezplot(fun,xmin xmax ymin ymax) clc;clear all; subplot(2,1,1) ezplot(x.2.*sin(x+y.2)+y2*exp(x+y)+5*cos(x.2+y) s

14、ubplot(2,1,2) ezplot(x.2.*sin(x+y.2)+y2*exp(x+y)+5*cos(x.2+y),-2*pi 2*pi -2*pi 2*pi) 4 ezplot(x,y,tmin tmax) clc;clear all; subplot(1,2,1) ezplot(2*(cos(t).3,2*(sin(t).3) subplot(1,2,2) ezplot(2*(cos(t).3,2*(sin(t).3,0 2*pi) 4 ezplot(fun,xmin,xmax) ezplot(fun,xmin xmax ymin ymax) ezplot(x,y,tmin tma

15、x) clc;clear all; subplot(2,2,1) ezplot(sin(x.3/x+1) subplot(2,2,2) ezplot(x.*sin(x.2-x-sin(y) subplot(2,1,2) ezplot(sin(t.2+t),sin(sin(t)*4.5) 4 plotyy(x,y1,x,y2) clc;clear all; x=0.1:0.1:2*pi; y1=sin(x); y2=2*x; plotyy(x,y1,x,y2) legend(sin(x),2x) 4 polar(theta,rho,s) clc;clear all; theta=0:0.1:2*

16、pi; rho=sin(2*theta).*cos(2*theta); polar(theta,rho,-r*) clc;clear all; theta=0:pi/10:4*pi; rho=1+theta; polar(theta,rho,-r*) 三维数据可视化 4 plot3(x,y,z,s) clc;clear all; t=0:pi/25:20*pi; x=t.*sin(t); y=t.*cos(t); z=t; plot3(x, y, z) grid on clc;clear all; t=0:0.02*pi:2*pi; x=sin(t); y=cos(t); z=cos(2*t)

17、; plot3(x,y,z,b-,x,y,z,bd) grid on 4 meshgrid产生平面区域的网格矩阵点 clc;clear all; x=-2*pi:2*pi; y=0*pi:4*pi; X,Y=meshgrid(x,y); plot(X,Y,o) 4 plot3(x,y,z) clc;clear all; x,y=meshgrid(-3:0.1:3); z=5*x.2-y.2+3; plot3(x,y,z) grid on 4 mesh(x,y,z) clc;clear all; x,y=meshgrid(-10:0.1:10); z=-x.2-y.2+200; mesh(x,y

18、,z) clc;clear all; x,y=meshgrid(-3:0.1:3); z=5*x.2-y.2+3; mesh(x,y,z) 4 mesh(x,y,z) clc;clear all; x,y=meshgrid(-3:0.1:3); z=peaks(x,y); mesh(x,y,z) %z=peaks(x,y)=3*(1-x).2.*exp(-(x.2)-(y+1).2)-10*(x/5-x.3-y.5).*exp(-x.2-y.2) -1/3*exp(-(x+1).2-y.2) 4 plot(x,y,z) mesh(x,y,z) clc;clear all; x,y=meshgr

19、id(-3:0.1:3); z=5*x.2-y.2+3; subplot(1,2,1) plot3(x,y,z) grid on subplot(1,2,2) mesh(x,y,z) 4 meshc(x,y,z) meshz(x,y,z) clc;clear all; x,y=meshgrid(-3:0.1:3); z=peaks(x,y); subplot(1,2,1) meshc(x,y,z) subplot(1,2,2) meshz(x,y,z) 4 waterfall(x,y,z) clc;clear all; x,y=meshgrid(-3:0.1:3); z=peaks(x,y); subplot(1,2,1) waterfall(x,y,z) xlabel(x) ylabel(y) zlabel(z) subplot(1,2,2) waterfall(x,y,z) xlabel(x) ylabel(y) zlabel(z) 4 surf(x,y,z) clc;clear all; x,y=meshgrid(-10:0.1:10); z=-x.2-y.2+200; surf(x,y,z) clc;clear all; x,y=me