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- %例15-1 NaN数据参与分析 a = magic(3) a(2,2) = NaN %用NaN表示遗失数据 sum(a) %对数据集进行求和- Example 15-1 NaN data involved in the analysis a = magic (3) a (2,2) = NaN missing data with NaN express sum (a) of data sets summation