从数据帧中删除所有值为NA的列
问题描述：
我无法自己解决这个问题：
数据框具有任意的属性作为列和每行表示一个数据集。
问题是：
如何摆脱列对于 ALL 行，值为NA ？
I'm having trouble with a data frame and couldn't really resolve that issue myself:
The dataframe has arbitrary properties as columns and each row represents one data set.
The question is:
How to get rid of columns where for ALL rows the value is NA?
答
尝试：
df <- df[,colSums(is.na(df))<nrow(df)]