View source: R/searchListOfVectors.R
searchListOfVectors | R Documentation |
Search List of Vectors
searchListOfVectors(q, lst)
q |
query vector |
lst |
list of vectors to search |
Taken from: http://stackoverflow.com/questions/11002391/fast-way-of-getting-index-of-match-in-list
a list of vectors with the same length as the query vector, each list entry will have indicies for lst where there was a match with the query vector. Return NA if there were no matches.
lst <- list(1:3, 3:5, 3:7) q <- c(3, 5) results <- searchListOfVectors(q, lst) names(results) <- q lst <- list(LETTERS[1:3], LETTERS[3:5], LETTERS[3:7]) q <- c("C", "E") searchListOfVectors(q, lst) lst <- list(LETTERS[3], LETTERS[4:6]) q <- "C" searchListOfVectors(q, lst) lst <- list(LETTERS[3], LETTERS[4:6]) q <- c("C") searchListOfVectors(q, lst) lst <- list(LETTERS[3], LETTERS[4:6]) q <- c("C", "E") searchListOfVectors(q, lst) lst <- list(LETTERS[3], LETTERS[4:6]) q <- "Z" searchListOfVectors(q, lst)
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