数据的可视化，rar文件里面包含了可视化的效果，可以画出4-D的图形，颜色作为第四维，更好的呈现数据的空间结构，可以用PCA等做降维的可视化展现-Data visualization, rar file which contains a visual effect, you can draw a 4-D graphics, color as the fourth dimension, the better the spatial structure of the present data, yo

主成分分析JAVA实现代码，可以实现数据的降维工作。-Principal component analysis JAVA code, can reduce the dimension of work data.