Count unique values for every column

Question

I would like to return the count of the unique values for every column in a table. For example, if I have the table:

 Testdata <- data.frame(var_1 = c(\"a         


        

Answer 1

Here, I've used dplyr and tidyr to count (using your Testdata data frame):

Testdata %>% 
  gather(var, value) %>% 
  distinct() %>% 
  count(var)

# # A tibble: 3 × 2
#     var     n
#    
# 1 var_1     1
# 2 var_2     1
# 3 var_3     3