实验六MATLAB数据可视化

1、实验六 MATLAB数据可视化一、实验目的掌握MATLAB二维、三维图形绘制，掌握图形属性的设置和图形修饰；掌握图像文件 的读取和显示。二、实验内容(1) 二维图形绘制。(2) 三维曲线和三维曲面绘制。(3) 图像文件的读取和显示。三、实验步骤1. 二维图形绘制(1) 二维图形绘制主要使用函数plot. clear all x=li nspace(0,2*pi,100); y1=si n( x); plot(x,y1) hold on y2=cos(x) plot(x,y2)(2) 函数plot的参数也可以是矩阵。 clear all x=li nspace(0,2*pi,100); y1=s

2、i n( x); y2=cos(x); A=y1 ; y2; B=x ; x plot(B,A)B =0.06350.06350.82510.82511.58671.58670.12690.12690.88850.88851.65011.65010.19040.19040.95200.95201.71361.71360.25390.25391.01551.01551.77711.77710.31730.31731.07891.07891.84051.84050.38080.38081.14241.14241.90401.90400.44430.44431.20591.20591.96751.9

3、6750.50770.50771.26931.26932.03092.03090.57120.57121.33281.33282.09442.09440.63470.63471.39631.39632.15792.15790.69810.69811.45971.45972.22132.22130.76160.76161.52321.52322.28482.28482.34832.34833.68113.68115.01395.01392.41172.41173.74453.74455.07735.07732.47522.47523.80803.80805.14085.14082.53872.5

4、3873.87153.87155.20435.20432.60212.60213.93493.93495.26775.26772.66562.66563.99843.99845.33125.33122.72912.72914.06194.06195.39475.39472.79252.79254.12534.12535.45815.45812.85602.85604.18884.18885.52165.52162.91952.91954.25234.25235.58515.58512.98292.98294.31574.31575.64855.64853.04643.04644.37924.3

5、7925.71205.71203.10993.10994.44274.44275.77555.77553.17333.17334.50614.50615.83895.83893.23683.23684.56964.56965.90245.90243.30033.30034.63314.63315.96595.96593.36373.36374.69654.69656.02936.02933.42723.42724.76004.76006.09286.09283.49073.49074.82354.82356.15636.15633.55413.55414.88694.88696.21976.2

6、1973.61763.61764.95044.95046.28326.2832(3) 选用绘图线性和颜色 clear all polt(x,y1,g+,x,y2,r:) grid on(4) 添加文字标注 title(正弦曲线和余弦曲线) ylabel(幅度) xlabel(时间) lege nd(si n( x),cos(x) gtext(leftarrows in x)(5) 修改坐标范围。 axis equal axis no rmal axis (0 pi 0 1.5)(6) 子图和特殊图形绘制。 subplot(2,2,1) t1=0:0.1:3; y1=exp(-t1); bar(

7、t1,y1); subplot(2,2,2) t2=0:0.2:2*pi; y2=s in (t2); stem(t2,y2); subplot(2,2,3) t3=0:0.1:3; y3=t3.A2+1; stairs(t3,y3); subplot(2,2,4) t4=0:0.1:2*pi; y4=abs(cos(2*t4); polar(t4,y4);2. 三维曲线和三维曲面绘制(1)三维曲线绘制使用polt3函数。绘制一条空间螺旋线 z=0:0.1:6*pi; x=cos(z); y=si n( z); plot3(x,y,z);练习：禾U用子图函数，绘制以上的空间螺旋线的俯视图、左视

8、图和前视图。mech()禾口 surf(),(2)三维曲面图的绘制：MATLAB绘制网线图和网面图的函数分别是 其具体操作步骤是：用函数meshgrid()生成平面网格点矩阵X,Y;由X,Y计算函数数值矩阵 Z;用mesh()绘制网线图，用surf()绘制网面图。绘制椭圆抛物面： clear all,close all; x=-4:0.2:4; y=x; X,Y=meshgrid(x,y); Z=X.A2/9+Y .A2/9; mesh(X,Y ,Z); title(椭圆抛物面网线图) figure(2) surf(X,Y ,Z); title(椭圆抛物面网面图)绘制阔边帽面 clear all,close all; x=-7.5:0.5:7.5; y=x; X,Y=meshgrid(x,y); R=sqrt(X.A2+Y .A2)+eps; Z=si n( R)./R; mesh(X,Y ,Z); title(阔边帽面网线图) figure(2) surf(X,Y,Z);