Let’s combine what we’ve learned about the first two-thirds of the allowable square bracket expressions by using both i and j in the same statements, as shown in the following code:
> tracks[artist=="Belle and Sebastian", trackname][1] "A Century Of Elvis" "A Century Of Elvis" "Dog On Wheels"...> tracks[artist=="Belle and Sebastian", .(artist, trackname)] artist trackname 1: Belle and Sebastian A Century Of Elvis 2: Belle and Sebastian A Century Of Elvis 3: Belle and Sebastian Dog On Wheels 4: Belle and Sebastian Dog On Wheels 5: Belle and Sebastian The Power Of Three --- 5553: Belle and Sebastian Fiction5554: Belle and Sebastian Your Cover’s Blown5555: Belle and Sebastian I Don’t Want To Play Football5556: Belle and Sebastian ...
