Get column index from label in a data frame

Question

Say we have the following data frame:

> df
  A B C
1 1 2 3
2 4 5 6
3 7 8 9

We can select column \'B\' from its index:

&g         


        

Answer 1

Use t function:

t(colnames(df))

     [,1]   [,2]   [,3]   [,4]   [,5]   [,6]  
[1,] "var1" "var2" "var3" "var4" "var5" "var6"