1. 조건에 맞는 데이터 찾기 (filter,slice 사용) > table(df$Type) Compact Large Midsize Small Sporty Van 16 11 22 21 14 9 > filter(df,Type=="Large" , Price=20) ## ,는 and 개념 Manufacturer Model Type Min.Price Price Max.Price MPG.city MPG.highway AirBags DriveTrain 1 Chrylser Concorde Large 18.4 18.4 18.4 20 28 Driver & Passenger Front 2 Eagle Vision Large 17.5 19.3 21.2 20 28 Driver & Passenger Front Cylinders ..