MATLAB二维画图函数使用总结

小灰灰 2021-11-09 19:46 288阅读 0赞

**简介：**  
在学习和工作中可借助MATLAB中的绘图函数方便的将数据处理成想要的二维或三维图形，从而可以更加直观地对数据进行分析。本篇主要总结二维绘图函数的使用方法。三维可参看：[三维绘图函数总结][Link 1]。  
**二维绘图函数总结：**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODY3OTkyNA_size_16_color_FFFFFF_t_70]  
**代码实现：**  
【注】：每个函数都提供了至少一个使用实例。使用时注意将代码前面的注释符号%去掉。

clear all; clc;
    %--------------------------
    % x = 0 : pi / 100 : 2 * pi;
    % y = sin(x);
    % plot(x, y);
    
    %--------------------------
    % t = -pi : pi / 100; pi;
    % x = t .* cos(3 * t);
    % y = t .* sin(t) .* sin(t);
    % plot(x, y);
    
    %--------------------------
    % x = linspace(0, 2 * pi, 100);
    % y = [sin(x); cos(x)];
    % plot(x, y);
    
    %--------------------------
    % t = linspace(0, 2 * pi, 100);
    % x = [t; t]';
    % y = [sin(t); cos(t)]';
    % plot(x, y);
    
    %---------------------------
    % x = 0 : pi / 100 : 2 * pi;
    % y = exp(j * x);
    % plot(y);
    
    %---------------------------
    % t = 0 : pi / 100 : 2 * pi;
    % x = exp(j * t);
    % y = [x; 2 * x; 3 * x]';
    % plot(y);
    
    %---------------------------
    % x = linspace(0, 2 * pi, 100);
    % plot(x, sin(x), ':', x, 2 * sin(x), '--', x, 3 * sin(x), '-.', x, 4 * sin(x));
    % legend('sin(x)', '2sin(x)', '3sin(x)', '4sin(x)');
    
    %-----------------------------
    % x = 0 : pi / 100 : 2 * pi;
    % y1 = 2 * exp(-0.5 * x);
    % y2 = -2 * exp(-0.5 * x);
    % y3 = 2 * exp(-0.5 * x) .* sin(2 * pi * x);
    % plot(x, y1, '--', x, y2, '--', x, y3);
    % % axis off;
    
    %--------------------------------------------
    % x1 = 0 : pi / 100 : 3 * pi;
    % x2 = 0 : pi / 100 : 3 * pi;
    % y1 = exp(-0.5 * x1) .* sin( 2 * pi * x1);
    % y2 = 1.5 * exp(-0.1 * x2) .* sin(x2);
    % plotyy(x1, y1, x2, y2);
    
    %-------------------------------------------
    % x = linspace(0, 10, 100);
    % y = [];
    % for x0 = x
    %     if x0 < 4
    %         y = [y, sqrt(x0)];
    %     elseif x0 < 6
    %         y = [y, 2];
    %     elseif x0 < 8
    %         y = [y, 5 - x0 / 2];
    %     elseif x0 >= 8
    %         y = [y, 1];
    %     end
    % end
    % plot(x, y);
    % axis([0, 10, 0, 2.5]);
    % title('分段函数');
    % xlabel('x'); ylabel('y');
    % text(2, 1.3, 'y = x^{1/2}');
    % text(4.5, 2.1, 'y = 2');
    % text(7, 1.6, 'y = 5 - x / 2');
    % text(8.5, 1.1, 'y = 1');
    
    %--------------------------------
    % x = 0 : pi / 100 : 2 * pi;
    % y1 = sin(x);
    % y2 = cos(x);
    % subplot(1, 2, 1); plot(x, y1);
    % title('sin(x)'); axis([0, 2 * pi, -1, 1]);
    % 
    % subplot(1, 2, 2); plot(x, y2);
    % title('cos(x)'); axis([0, 2 * pi, -1, 1]);
    
    %--------------------------------------------
    % x = 0 : 0.35 : 7;
    % y = exp(-0.5 * x);
    % subplot(2, 2, 1); bar(x, y);
    % subplot(2, 2, 2); stairs(x, y);
    % subplot(2, 2, 3); stem(x, y);
    % subplot(2, 2, 4); fill(x, y, 'b');
    
    %--------------------------------------------
    % theta = 0 : pi / 100 : 2 * pi;
    % rho = theta;
    % polar(theta, rho);
    
    %-------------------------------------------
    % x = 0 : 0.01 : 10;
    % y = 10 * x .* x; % y = 10 * x^2
    % subplot(2, 2, 1); plot(x, y);
    % subplot(2, 2, 2); semilogx(x, y);
    % subplot(2, 2, 3); semilogy(x, y);
    % subplot(2, 2, 4); loglog(x, y);
    
    %--------------------------------------------------------------
    % subplot(2, 2, 1); fplot(@(x)sin(x), [0, 2 * pi]);
    % subplot(2, 2, 2); fplot(@(x)[sin(x), cos(x)], [0, 2 * pi]);
    % %图3, 4对比可知，图3显示的细节更多
    % subplot(2, 2, 3); fplot(@(x)cos(tan(pi * x)), [-0.4, 1.4]);
    % x = -0.4 : 0.01 : 1.4;
    % subplot(2, 2, 4); plot(x, cos(tan(pi * x)));
    %--------------------------------------------------------------
    subplot(1, 2, 1); pie([0.1, 0.2, 0.3, 0.2, 0.15, 0.05]);
    subplot(1, 2, 2); compass([1 + j, -2 + 3i, -2-3j, 2-3j]);

[Link 1]: https://blog.csdn.net/weixin_38679924/article/details/98092203
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODY3OTkyNA_size_16_color_FFFFFF_t_70]: /images/20211109/49920ccfa19c47c89c186b2087c26ba9.png