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Ch5降维部分请教 #14

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hunterhawk opened this issue Aug 4, 2019 · 1 comment

hunterhawk commented Aug 4, 2019

老师你好，最近在看机器学习-白板推导系列视频，有一个小问题，在第五章降维部分的P3，推导最大投影方差时，计算J(u_1)时用到了(x_i-x_ba)u_1为一个实数，因此可以对调写成u_1(x_i-x_ba),这里怎么说明它是一个实数呢？

Huanianss commented Aug 20, 2019

是行向量乘以列向量为实数吧

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