In [ ]:
# help(mean)
# args(sd)
# ?mean
# example(mean)
In [ ]:
# help.search("adf.test")
# help.search("adf.test", package = "tseries")
# ??adf.test
Note the double quote is not needed for ??
But in other 2 cases, double quote is needed.
In [ ]:
# help(package = "dplyr")
# vignette(package = "dplyr")
In [ ]:
# RSiteSearch("dplyr")
Also try to search the following