Merging all the colunms in R with colunm names

Question

I have the following data

> df
X1  X2  X3 
1   3   4  
1   0   0  
1   1   0 

and I want to merge all the column so that the final output will

Answer 1

You can try gathering the column names with tidyr

library(tidyr)

X1 <- c(1,1,1)
X2 <- c(3,0,1)
X3 <- c(4,0,0)

df <- data.frame(X1, X2, X3)

df <- df %>%
  gather(new, colname, X1, X2, X3)

print(df)

  new colname
1  X1       1
2  X1       1
3  X1       1
4  X2       3
5  X2       0
6  X2       1
7  X3       4
8  X3       0
9  X3       0