r - Interleave two columns of a data.frame

Question

I have a data frame like this:

 GN  SN  
  a   0.1   
  b   0.2   
  c   0.3   
  d   0.4   
  e   0.4 
  f   0.5

I would like the following output:

 GN    
  a      
  0.1      
  b      
  0.2      
  c    
  0.3   

Can anyone help me? How to "interleave" the elements of the second column to the elements of the first column to gain the desired output?

Answer 1

First let's create some data:

dd = data.frame(x = 1:10, y = LETTERS[1:10])

Next, we need to make sure the y column is a character and not a factor (otherwise, it will be converted to a numeric)

dd$y = as.character(dd$y)

Then we transpose the data frame and convert to a vector:

as.vector(t(dd))

However, a more pertinent question is why you would want to do this.