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2010 Apr 07
3
match function or "=="
Hi all,
I have a huge dataset(5000k observations), which contains the daily sales
for each company.
If I want to find out the a company with unique company id number, which
function I should use that is more efficient, match or "=="? For example,
use<-dataset[!is.na(match(dataset$companyID, 12345)),]
or
use<-dataset[dataset$companyID==12345,]
Thank you very much.
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