grepl.sub: Subset a data frame if a specified pattern is found in a...

In nyu-mhealth/Mobility: Tools for Understanding Mobility Data

Subset a data frame if a specified pattern is found in a character string

Description

Subset a data frame if a specified pattern is found in a character string

Usage

grepl.sub(data, pattern, Var, keep.found = TRUE, ...)

Arguments

data	data frame.
pattern	character vector containing a regular expression to be matched in the given character vector.
Var	character vector of the variables that the pattern should be found in.
keep.found	logical. whether or not to keep observations where the pattern is found (TRUE) or not found (FALSE).
...	arguments to pass to grepl.

Examples

# Create data frame
ABData <- data.frame(a = c("London, UK", "Oxford, UK", "Berlin, DE",
                    "Hamburg, DE", "Oslo, NO"),
                   b = c(8, 0.1, 3, 2, 1))

# Keep only data from Germany (DE)
ABGermany <- grepl.sub(data = ABData, pattern = "DE", Var = "a")

nyu-mhealth/Mobility documentation built on July 4, 2025, 9:54 a.m.