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name_r
2009 Apr 09
2
how to automatically select certain columns using for loop in dataframe
..."Argo"),
NUM_B = 1:5, NAME_B = c(NA, "Barn", "Bolton",
"Bravo", NA),
NUM_C = 1:5, NAME_C = c("Candy", NA, "Cecil",
"Crayon", "Corey"),
NUM_D = 1:5, NAME_D = c("David", "Delta", NA, NA,
"Dummy") )
col_names <- c("A", "B", "C", "D")
> all.data
NUM_A NAME_A NUM_B NAME_B NUM_C NAME_C NUM_D NAME_D
1 1 Andy 1 <NA> 1 Candy 1 David
2 2 Andrew 2...