R的问题。创建满足所有4个条件的新数据集 [英] R question. Create new data set that meets all of 4 conditions

问题描述

我想创建一个新的数据集，同时满足以下四个条件。

I would like to create a new dataset where the following four conditions are all met.

rowSums(is.na(UNCA[,11:23]))<12

rowSums(is.na(UNCA[,27:39]))<12

rowSums(is.na(UNCA[,40:52]))<12

rowSums(is.na(UNCA[,53:65]))<12

！

推荐答案

然后使用& 运算符：

UNCA.new <- UNCA[rowSums(is.na(UNCA[,11:23])) < 12 & 
                 rowSums(is.na(UNCA[,27:39])) < 12 & 
                 rowSums(is.na(UNCA[,40:52])) < 12 &  
                 rowSums(is.na(UNCA[,53:65])) < 12, ]

单个& 是向量函数，而双精度& 是一元的（例如，通常在 if 语句中使用） 。

A single & is a vectorized function, while a double && is unary (typically used in an if statement, for instance).

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