r - Error selecting columns in dataframe -


this easy question still not able figure out i'm wrong.

i have following dataframe

 data3 <- structure(list(p1 = c("david skoch", "viktor troicki", "peter luczak",                    "simon stadler", "philipp petzschner", "jamie murray", "michal mertinak",                    "igor kunitsyn", "daniel munoz de la nava", "alexandre sidorenko"),             p2 = c("lovro zovko", "dmitri sitak", "martin vassallo arguello",                    "sebastien de chaunac", "n.sriram balaji", "jaroslav levinsky",                    "stephen amritraj", "wesley moodie", "andrey golubev", "nicolas tourte"),             date = structure(c(1167618386.44068, 1167619381.13208, 1167622892.30769,                                   1167626322.58065, 1167627172.88136, 1167629162.26415, 1167635959.32203,                                   1167636184.61538, 1167638943.39623, 1167643045.16129), tzone = "utc", class = c("posixct","posixt")),             factor = c(0.82, 1.28, 1.37, 1.37, 1.28, 1.28, 1.46, 0.73, 1.82, 1.55), weight = c(1.1, 1.1, 1.1, 1.1, 1.1, 1.1, 1.1, 1.1, 1.1, 1.1)),        .names = c("p1", "p2", "date", "factor", "weight"), class = c("data.table", "data.frame"), row.names = c(na, -10l))

which trying subset with:

data3[,c("weight","date","factor")]

that unfortunately gives following result:

[1] "weight" "date"   "factor"

instead of selecting dataframe specified columns.

any hint?

we need use with = false data.table.

data3[,c("weight","date","factor"), = false]

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