中文说明：使用MATLAB实现SVM回归算法，实现四种样品气体的分类，并显示出气体浓度。代码完善，并且已经在项目中使用。
English Description：
Using MATLAB to realize SVM regression algorithm, realize the classification of four kinds of sample gas, and show the gas concentration. The code is perfect and has been used in the project.