It's just something to remember: if you have a square matrix times a column vector, the product that makes sense is with the matrix on the left, and the vector on the right.
只要记住：如果你要用一个方阵，乘以一个列向量，当矩阵在左，向量在右的时候乘积才有意义。
One thing that can be confusing about R's "everything is a vector" approach is that row-wise and column-wise operations may not adhere to your intuition.
关于 R 的 “所有东西都是向量” 方式，容易引起混乱的一点是行操作和列操作可能不符合直觉。
A new method based on column vector average of the autocorrelation matrix without eigendecomposition is presented to estimate the channel vector.
本文提出一种基于相关矩阵列矢量平均的信道估计算法，该算法不需要特征分解或跟踪。
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