[R] Extracting a dataframe column as a dataframe

[Dimitri Shvorob]

> x = structure(list(time = structure(c(1020232904.818, 1020232904.818
), class = c("POSIXt", "POSIXct"), tzone = ""), price = c(321, 
323.5)), .Names = c("time", "price"), row.names = 1:2, class = "data.frame")
> x1 = x[,c("price")]
> dput(x1)
c(321, 323.5)

Is there similar syntax that gets "price" as a (single-column) dataframe? (I
know that I can use "subset(... select = ...)")..
Thank you. 
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