cmean使用起来与mean一样，可以对高维数组进行统计，其中cmean把数据中的nan完全剔除了，返回的是有值时的平均（如果都是缺测，也是返回nan）。不会向mean那样，如果有缺测，平均值也为缺测 csum与sum类似。 实际观测中常常

Packet : mean_sum.rar filelist
csum.m
cmean.m

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