Folks:
I've been working more and more in data.table and it gets better and better
as I learn to use it....
So my question is, in the following example, is the Where statement
inefficient because I'm using "==" ? (I just want to use the subsets where
days are equal to the values in the statement)
Should I do this another way? (Btw, I get exactly the right answer using
this approach...)
db <- DB4[
Days==1 | Days==5 | Days==10 | Days==20 | Days==30 | Days==60 | Days==90,
j = {list(v=m_func(x,y,z))},
by= "Date,Indicator,Days"
]
If more detail is necessary, lmk. Date, Indicator, and Days are keys.
Best,
John
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