Remove rows which have all NAs in certain columns

Question

Suppose you have a dataframe with 9 columns. You want to remove cases which have all NAs in columns 5:9. It\'s not at all relevant if there are NAs in columns 1:4.

S

Answer 1

Here are two dplyr options:

library(dplyr)
df <- data_frame(a = c(0, NA, 0, 4, NA, 0, 6), b = c(1, NA, 0, 4, NA, 0, NA), c = c(1, 0, 1, NA, NA, 0, NA))


# columns b and c would be the columns you don't want all NAs

df %>% 
  filter_at(vars(b, c), any_vars(!is.na(.)))

df %>% 
  filter_at(vars(b, c), any_vars(complete.cases(.)))

# A tibble: 5 x 3
      a     b     c
    
1     0     1     1
2    NA    NA     6
3     0     6     1
4     4     4    NA
5     0     0     0