Convert data frame of N columns into a data frame of two 'stacked' columns

Question

Hello Stack Community.

I am doing work with network analytics and have a data reshaping question.

My original data comes in as a series of columns each colu

Answer 1

If I understand correctly, you can just use unlist and manually create your data.frame:

mydf[] <- lapply(mydf, as.character)  # Convert factors to characters
final_output <- data.frame(Source = unlist(mydf[-length(mydf)]), 
                           Target = unlist(mydf[-1]))
head(final_output, 15)
#       Source Target
# varA1      A      B
# varA2      A      B
# varA3      A      B
# varA4      A      B
# varA5      A      B
# varA6      A      B
# varB1      B      C
# varB2      B      C
# varB3      B      C
# varB4      B      C
# varB5      B      C
# varB6      B      C
# varC1      C      D
# varC2      C      D
# varC3      C      D