grepl

英文: Where to place is.na() when using grepl to find non-missing non-matches? 问题 我想找到那些在var2中没有包含已定义表...

英文: Filter a dataframe based on a selection of string values found across multiple columns 问题 我有一个庞大...

英文: How to check for existence of a set of columns in large dataframes? 问题 我正在从多年的调查数据中构建重复的横截面数据（面板...

英文: How to use grep or grepl in order to identify variables? 问题 下午好。以下是情况： 我有一个名为"dep"的变量，...

英文: Rearranging a R dataframe (changing to wide format based on certain conditions, renaming and res...

英文: R: Dplyr: How to Check if the Value of One Variable is Contained in Another 问题 我有数百条记录，其中包含"...

英文: R dataframe/ lapply(): get rid of rows with particular values in columns containing particular s...

英文: Count how many times each string from a column appear (no exact match) in another column in R 问题...