tabletable.compute("Var()"，filter)产生错误的结果

问题描述

我想计算我的数据表对象中col的方差.如果我应用datatable.compute(Var(...))，则给出否定结果.方差不能为负.而且我只是将其应用于一半的数据，效果很好.问题是什么?

感谢

I want to calculate variance of a col in my datatable object. If i apply datatable.compute(Var(...)), i gives a negative result. Variance can't be negative. And it I just apply it to half of the data, it works fine. What is the problem? Does datatable.compute has a limited capacity?

Thanks

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