Concatenate strings by group with dplyr for multiple columns [duplicate]

Answer 1

For these purposes, there are the summarise_all, summarise_at, and summarise_if functions. Using summarise_all:

df %>%
  group_by(Sample) %>%
  summarise_all(funs(paste(na.omit(.), collapse = ",")))

# A tibble: 3 × 5
  Sample group Gene1 Gene2 Gene3
       
1      A   1,2   a,b            
2      B     1           c      
3      C 1,2,3 a,b,c         d,e