Summary
Logical indexing involves using boolean conditions inside indexing brackets to selectively return only those rows of a data structure that meet specified criteria.

General domain of usage
Data frame manipulation and filtering in data analysis

**Logical indexing** allows you to filter rows of a data frame based on **conditions**. Instead of remembering row numbers, you specify logical expressions, and only rows where the condition is `TRUE` are returned.

name <- c("Alex", "Julia", "Finn")
age <- c(24, 43, 32)
gender <- c("M", "F", "M")
test <- data.frame(name, age, gender)

# People older than 30
test[test$age > 30, ]
# Males only
test[test$gender == 'M', ]

The condition should be placed in the row index position inside square brackets (`[condition, ]`).

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Logical Indexing

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Logical Indexing

Example

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