r - aggregate function fails in knitr but succeeds in console -


i have following r code:

cleandata <- aggregate(x = stormdata[c("fatalities", "injuries")],                        = list(tolower(stormdata$evtype)), sum)

it runs fine in r studio console, when copy/paste in chunk in knitr generates error:

error in `$<-.data.frame`(`*tmp*`, "harm", value = c(15, 0, 2, 2, 2, 6,  :    replacement has 902297 rows, data has 898 calls: <anonymous> ... withvisible -> eval -> eval -> $<- -> $<-.data.frame

i'm not sure why happening.


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