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What are the variances of the indices y1 = x1-2x2+5x3 and y2 = 6x2-4x3? Notice this holds for any vector μ and symmetric positive -definite matrix V, as | V | > 0. The principal components (or PCs) of a covariance matrix define the axes of variation. PC1 is the direction (linear combination cTx) that explains the most variation.

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2013年3月20日 · How can I convert this into a data.frame? Output should be a 6x23 data.frame and preferably with the correct column names. The number of rows is the length() of the top level list and the number of columns is combined length() of the lower-most level lists. I tried doing this as suggested here (R list to data frame):

6x23, 视频播放量 148、弹幕量 0、点赞数 3、投硬币枚数 0、收藏人数 2、转发人数 0, 视频作者 whiteroseheart, 作者简介 分享动漫跟电视剧，相关视频：5x23，3x23，4x23，1x23，5x23，3x23，6x25，2x10，5x03，7x16

Find out what is 6 times 23. Multiply 6x23. Calculate six multiplied by twenty-three (6*23).

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