When I'm using the function "grepl" for 1, 2, 3 or 4 keywords at a time, I don't have any issues:
test_03_13[,5] = grepl("distance", test_03_13$tweet, ignore.case = TRUE)
test_03_13[,5:6] = grepl("distance", "miles", test_03_13$tweet, ignore.case = TRUE)
test_03_13[,5:7] = grepl("distance", "miles", "kilometers", test_03_13$tweet, ignore.case = TRUE)
test_03_13[,5:8] = grepl("distance", "miles", "kilometers", "near", test_03_13$tweet, ignore.case = TRUE)
From the moment I put a 5th keyword, I have an "unused argument" error :
test_03_13[,5:9] = grepl("distance", "miles", "kilometers", "near", "radius", test_03_13$tweet, ignore.case = TRUE)
Error in grepl("distance", "miles", "kilometers", "near", "radius", test_03_13$tweet, :
unused argument (test_03_13$tweet)
Can someone explain to me what happened and what I can do to resolve this, please