r Индекс возврата строк, которые имеют NA в DataFrame

# Basic syntax:
which(is.na(your_dataframe), arr.ind=TRUE)
# Where:
#	- which returns the dataframe row indices for rows that contain
#		a logical of TRUE
#	- is.na processes the dataframe and converts all values to TRUE or 
#		FALSE based on whether they are NA or not
Charles-Alexandre Roy