The data in column two is to use column one (x data) as reference.
第2列中的数据使用第1列(x数据)作为参照。
For the X-axis, we only need to specify the first column where the data starts.
对于x轴，我们仅需要指定数据开始的第一列。
For matrices, mean (X) is a row vector containing the mean value of each column.
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.
对于矩阵来说，MEAN (X)是包含了每列平均值的行向量。
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