1. 图形绘制:
1.1 离散数据及离散函数:
1 | X1 = [1 2 4 6 7 8 10 11 12 14 16 17 18 20]; |
1.2 连续函数:
1 | X1 = (0:12)*pi/6;Y1 = cos(3*X1); |
1.3 图形绘制示例:
绘制函数$y=x+\sin x+e^{x}$,其中:$x \in\left[-\frac{\pi}{2}, \frac{\pi}{2}\right]$
1 | x = -pi/2:0.01:pi/2; |
2. 二维图形绘制:
2.1 plot
指令:
1 | X = -10:10; Y = X.^2; |
1 | 画矩阵A |
1 | for i=1:5 |
1 | j = sqrt(-1); |
1 | x = -pi:pi/10:pi; |
1 | % plot函数绘制包络线 |
1 | clear all |
2.2 格栅:
1 | X = (0:1800)*pi/180; Y = cos(X/2); |
2.3 文字说明:
1 | x = 0:0.01*pi:pi*0.5;y = cos(x)+sqrt(-1)*sin(x); |
2.4 线型,标记,颜色:
1 | figure |
2.5 坐标轴设置:
1 | X = (0:1800)*pi/180; Y = cos(X/2); |
2.6 图形迭绘:
1 | figure |
2.7 子图绘制:
1 | figure |
2.8 交互式绘图:
ginput
指令;gtext
指令;zoom
指令;
2.9 双坐标轴绘制:
1 | figure |
2.10 fplot
绘图指令:
function0.m
文件:
1 | function F = function0(x) |
figurefplot.m
文件:
1 | fplot('function0', [-0.2 0.2], 1e-4); |
2.11 ezplot
绘图指令:
1 | ezplot('sin(x)^2+4*cos(y)^2=4',[-5 5 -1 1]); |
2.12 特殊坐标轴绘图:
semilogx
函数:(x
轴使用对数坐标)
1 | x = 10.^(0.1:0.1:4);y = 1 ./ (x+100); |
semilogy
函数:(y
轴使用对数坐标)loglog
函数:(x
轴和y
轴均使用对数坐标)
1 | a = 0.1:0.1:5;x = log10(a); y = 10.^a; |
2.13 二维特殊图形函数:
bar
函数:(绘制二维垂直条形图)
1 | y = [75.995 91.972 105.711 123.203 131.669 150.697 179.323 203.212 226.505 249.633 281.422]; |
1 | x=-2:2; |
1 | x = [1 5 0.5 3.5 2]; |
1 | x = -4:0.1:4; |
1 | clear all |
3. 三维图形绘制:
3.1 曲线图绘制:
1 | theta = 0:.01*pi:2*pi;x = sin(theta);y = cos(theta); z = cos(4*theta); |
3.2 网格图绘制:
1 | X = -10:0.1:10; Y = -10:0.1:10; |
3.3 曲面图的绘制:
1 | [x,y,z]=peaks(25); |
3.4 光照模型:
1 | figure |
1 | clear |
3.5 绘制等值线图:
1 | clear |
4. 四维图形可视化:
4.1 用颜色描述第四维:
1 | clear |
4.2 其他函数:
除了surf
函数外,mesh
和pcolor
函数也可以将四维的数据加到颜色属性上;
参考文献:
MATLAB R2014a
完全自学一本通