Eigen3.2.8为矩阵计算工具，需要编译后才能运行，在官网找了很久，发现没有这个版本了，然后上传一份，方便后面有需要的人使用，可以在openCV、PCL等库中应用-Eigen3.2.8 for the matrix calculation tool, you need to compile to run, in the official website to find a long time, found that there is no such version, and then upl

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