Extract labels from a list of objects — extract

Retrieves the "label" attribute from each element in a list and returns a character vector of labels.

Usage

extract_labels(data)

Arguments

data: A list of objects. Each element is expected to have a "label" attribute (e.g., created via attr(x, "label") <- "some label").

Value

A character vector containing the "label" attribute of each element in data. If an element does not have a "label" attribute, NA_character_ is returned for that element.

Examples

# Create example data with labels
x1 <- 1:3
attr(x1, "label") <- "First variable"

x2 <- 4:6
attr(x2, "label") <- "Second variable"

x3 <- 7:9
# No label set for x3

data <- list(x1, x2, x3)

# Extract labels
extract_labels(data)
#> [1] "First variable"  "Second variable" NA               

# Works for data frames as well
data <- data.frame (x1, x2, x3)
extract_labels(data)
#>                x1                x2                x3 
#>  "First variable" "Second variable"                NA