igr_is_valid {igr}

Check if Irish grid references are valid

Description

igr_is_valid() identifies valid Irish grid references.

Usage

igr_is_valid(x)

Arguments

x

A character vector of Irish grid references.

Details

Valid Irish grid references consist of a letter (other than I) optionally followed by both an easting and northing. The easting and northing must be of the same length of between 1 and 5 digits. There may be whitespace between the letter, easting and northing.

Value

A logical vector indicating the validity of each Irish grid reference.

Examples

# A vector of alternating valid and invalid Irish grid references
v <- c("N8090", "D 12 345 88800", "W34", "I30", "W", "A123", "B1234", "")

# Check validity of Irish Grid coordinates
igr_is_valid(v)