第一个列向量是正2，负1，对么？

So the first column is over 2 and down 1, right?

youdao

所以这是第一个列向量，向量1。

So there is the first column, the first column, column 1.

youdao

我画出这些列向量。

I'll draw these columns as they are.

youdao

我们想要知道向量的行数和列数。

We would like to know the number of rows and number of columns.

youdao

对于矩阵来说，MEAN (X)是包含了每列平均值的行向量。

For matrices, mean (X) is a row vector containing the mean value of each column.

youdao

对于矩阵来说，MEAN (X)是包含了每列平均值的行向量。

For matrices, mean (X) is a row vector containing the mean value of each column.

youdao