2 messages · analyst41 at hotmail.com, Gabor Grothendieck
an example available on the net goes like
df
identifier quantity 1 1 10 2 1 20 3 2 30 4 1 15 5 2 10 6 3 20
aggregate(df$quantity, by=list(df$identifier), sum)
Group.1 x 1 1 45 2 2 40 3 3 20 I'd like Group.1 to retain the name "identifier" and would like to control what "x" get called in the output. Thanks.
On Mon, Jan 10, 2011 at 8:23 PM, analyst41 at hotmail.com
an example available on the net goes like
df
?identifier quantity 1 ? ? ? ? ?1 ? ? ? 10 2 ? ? ? ? ?1 ? ? ? 20 3 ? ? ? ? ?2 ? ? ? 30 4 ? ? ? ? ?1 ? ? ? 15 5 ? ? ? ? ?2 ? ? ? 10 6 ? ? ? ? ?3 ? ? ? 20
aggregate(df$quantity, by=list(df$identifier), sum)
?Group.1 ?x 1 ? ? ? 1 45 2 ? ? ? 2 40 3 ? ? ? 3 20 I'd like Group.1 to retain the name "identifier" and would like to control what "x" get called in the output. ?Thanks.
Try these:
aggregate(quantity ~ identifier, df, sum)
identifier quantity 1 1 45 2 2 40 3 3 20
aggregate(df["quantity"], df["identifier"], sum)
identifier quantity 1 1 45 2 2 40 3 3 20
aggregate(list(Quantity = df$quantity), df["identifier"], sum)
identifier Quantity 1 1 45 2 2 40 3 3 20
Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com