From e11534dbe9e10759df7b2517545b5956f7ba541a Mon Sep 17 00:00:00 2001
From: xuejianjun <xuejianjun1990@gmail>
Date: Wed, 1 Mar 2017 22:00:43 +0800
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 README.md | 1 +
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diff --git a/README.md b/README.md
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@@ -29,6 +29,7 @@
 ## 第四部分  其他工具
 
 * 13) 使用PCA来简化数据
+     *[利用PCA来简化数据](./docs/13.利用PCA来简化数据.md)
 * 14) 使用SVD简化数据
 * 15) 大数据与MapReduce