删除字符串长度大于n的所有行 [英] Remove all rows where length of string is more than n

问题描述

我有一个数据框 m ，我想删除所有 f_name 列有更大条目的行我假设我可以使用类似于

I have a dataframe m and I want to remove all the rows where the f_name column has an entry greater than 3. I assume I can use something similar to

m <- m[-grep("nchar(m$f_name)>3", m$f_name]

推荐答案

如果你想保留那些f_name中的条目长度不超过3的行，那么怎么样：

To reword your question slightly, you want to retain rows where entries in f_name have length of 3 or less. So how about:

subset(m, nchar(as.character(f_name)) <= 3)

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