Hi
I did search but did not see an answer.
I have a dt with 580 + columns. many of the columns will have variations of
a name to specifically identify them, ie, call23,Call111, doCall.now, etc.
Since I cannot recall the exact column names I have been resorting to df
<- data.frame(dt) and then
a <- grep("Call1", colnames(df))
colnames(df[a])
which then returns the columns names containing Call1.
If I try this with the data table ie, colnames(dt[a]) I get null.
Any suggestions? I am feeling rather ignorant converting a dt back to a
data frame and available memory may be a concern further down the road.
Carl Sutton
-----
Carl Sutton
--
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