Dear all,
I have a datatable (mydt) with a reference column (code) for which I set
a key, and a set of numeric columns (A ,B, C, D, E).
I obtain this from a serie of script codes, but the issue is that I have
duplicated rows (code), So i want to do is according to codestation, for
each of the columns..
I could do the following code for one single column:
result<-mydt[,sum(A),by=code]
but I would like to know if it is possible to do it for each of the
columns, so I get a databable with the same columns with sum value,
group by codestation. Do you have any suggestion?
I thank you a lot in advance for your answer,
Best regards,
Emmanuel
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