Check out example codes for "r return index of rows that have NA in dataframe". It will help you in understanding the concepts better.
Code Example 1
# 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
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