keys {datastructures} | R Documentation |
Extracts the keys from a map
object.
keys(obj) ## S4 method for signature 'bimap' keys(obj) ## S4 method for signature 'unordered_map' keys(obj)
obj |
object to extract keys from |
returns the extracted keys as vector
# returns the keys of a hashmap h_map <- hashmap("numeric") h_map[rnorm(3)] <- list(1, 2, 3) keys(h_map) # returns the keys of a multimap m_map <- multimap("numeric") m_map[c(1, 2, 1)] <- list(rnorm(1), rgamma(1, 1), rexp(1)) keys(m_map)