ベクトル(文字列)の頻度を可視化したい with dplyr, ggplot2 - My Life as a Mock Quant の続きみたいなもん。前回の記事では > sample(letters[1:15], 100, replace=TRUE) [1] "j" "n" "a" "n" "a" "l" "l" "h" "d" "o" "l" "l" "c" "f" "m" "g" "c" "j" "h…