combine rows in data frame containing NA to make complete row

Question

I know this is a duplicate Q but I can\'t seem to find the post again

Using the following data

df <- data.frame(A=c(1,1,2,2),B=c(NA,2,NA,4),C=c(3,         


        

Answer 1

A different tidyverse possibility could be:

df %>%
 gather(var, val, -A, na.rm = TRUE) %>%
 group_by(A, var) %>%
 distinct(val) %>%
 spread(var, val)

      A     B     C     D     E
      
1     1     2     3     2     5
2     2     4     5     3     4

Here it, first, performs a wide-to-long data-transformation, excluding the "A" column and removing the missing values. Second, it groups by "A" column and the variable names. Third, it removes the duplicate values. Finally, it returns the data to its original wide format.