为什么我的矩阵成为向量的向量？-Whydoesmymatrixbecomeavectorofvectors?

Your matrix doesn't become a vector of vectors. It becomes a matrix of lists having 8 rows. This happens since you supply a list (data.frame) that contains 8 elements as the data argument to matrix(), which then creates a matrix of the list with a default of 1 column.

你的矩阵不会成为矢量的矢量。它成为具有8行的列表矩阵。发生这种情况是因为您提供了一个包含8个元素的列表(data.frame)作为matrix()的数据参数,然后创建一个默认为1列的列表矩阵。

You basically did:

你基本上做了:

matrix(list(1:3,2:4,3:5))
     [,1]     
[1,] Integer,3
[2,] Integer,3
[3,] Integer,3

as @MrFlick notice in the comments you probably want as.matrix(full[ ,4:11]), this will convert your subset, full[ ,4:11], with class data.frame into a matrix of atomic elements following R's coercion hierarchy.

在你可能想要as.matrix(full [,4:11])的评论中注意@MrFlick,这将把你的子集full [,4:11]和class data.frame转换成R之后的原子元素矩阵强制等级。