从数据框中删除具有零值的列 [英] Remove columns with zero values from a dataframe

问题描述

我有一个数据框:

SelectVar
     a   b  c   d   e   f   g   h   i j k l ll m n o p  q   r
1 Dxa8 Dxa8 0 Dxa8 Dxa8 0 Dxa8 Dxa8 0 0 0 0  0 0 0 0 0 Dxc8 0
2 Dxb8 Dxc8 0 Dxe8 Dxi8 0 tneg tpos 0 0 0 0  0 0 0 0 0 Dxi8 0

我想从数据框中删除两行中具有零值的列，因此它产生如下数据框:

I would like to remove the columns with zero values in both rows from the data frame, so it yields a data frame as below:

SelectVar
     a   b    d    e    g   h     q   
1 Dxa8 Dxa8 Dxa8 Dxa8 Dxa8 Dxa8  Dxc8 
2 Dxb8 Dxc8 Dxe8 Dxi8 tneg tpos  Dxi8 

尝试过:

SelectVar!=0

产生真/假数据帧，并且:

which yields a True/False dataframe, and:

SelectVar[, colSums(abs(SelectVar)) ! == 0]

产生错误.

如何删除每行中值为零的列?

How could I remove the columns with zero values in each row?

推荐答案

您几乎拥有它.把这两个放在一起:

You almost have it. Put those two together:

 SelectVar[, colSums(SelectVar != 0) > 0]

这是有效的，因为因子列被评估为 >= 1 的数字.

This works because the factor columns are evaluated as numerics that are >= 1.

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