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R
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R-4.2.2
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library
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vroom
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fwf
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File: vroom-base.R
library(vroom) x <- vroom_fwf(file, fields, col_types = types) print(head(x, 10)) a <- head(x) b <- tail(x) c <- x[sample(NROW(x), 100), ] d <- x[x$PERSONS== "06", ] e <- tapply(x$TOTPUMA5, x$STATE, mean)