MATLAB实例：二维散点图

用MATLAB实现简单的散点图的绘制，可以自行设置点的形状与颜色，可以去掉坐标轴边框。

数据来源：MATLAB高斯混合数据的生成 将二维数据保存为gauss.txt。

1. demo.m

% data_load: https://www.cnblogs.com/kailugaji/p/10861064.html

% data_load: 前两列是二维数据，最后一列是类标签

data_load=dlmread('.\gauss.txt');

figure(1)

plot(data_load(data_load(:, end)==1, 1), data_load(data_load(:, end)==1, 2), 'b.', 'MarkerSize',12 );

hold on

plot(data_load(data_load(:, end)==2, 1), data_load(data_load(:, end)==2, 2), 'r^', 'MarkerSize',6, 'MarkerFaceColor','r');

plot(data_load(data_load(:, end)==3, 1), data_load(data_load(:, end)==3, 2), 'ko', 'MarkerSize',6, 'MarkerFaceColor','g');

plot(data_load(data_load(:, end)==4, 1), data_load(data_load(:, end)==4, 2), 'rp', 'MarkerSize',6, 'MarkerFaceColor','y');

plot(data_load(data_load(:, end)==5, 1), data_load(data_load(:, end)==5, 2), 'mh', 'MarkerSize',6, 'MarkerFaceColor','m');

ylabel('X');

xlabel('Y');

% set(gca,'Visible','off') %去掉横纵坐标边框

saveas(gcf,sprintf('demo_2D.jpg'),'bmp'); %保存图片

2. 结果

去掉边框后：