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650948
2009 Oct 15
1
tapply() and using factor() on a factor
Dear List,
Shouldn't result1 and result2 be equal in the following case?
Note that log$RequestID is a factor. That is, is.factor(log$RequestID)
yields TRUE.
result1 <- tapply(log$Flag,factor(log$RequestID),sum)
result2 <- tapply(log$Flag,log$RequestID,sum)
Yet, when I summarize the output, I get the following:
summary(result1)
Min. 1st Qu. Median Mean 3rd Qu.