Format number in R with both comma thousands separator and specified decimals

formatC(1000.64, format="f", big.mark=",", digits=1)

(sorry if i'm missing something.)

format not formatC:

format(round(as.numeric(1000.64), 1), nsmall=1, big.mark=",") # 1,000.6

formattable provides comma:

library(formattable)

comma(1000.64, digits = 1) # 1,000.6

comma provides an elementary interface to formatC.