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num_mb
2009 Apr 09
2
how to automatically select certain columns using for loop in dataframe
...re
certain condition (for example, part of the column name). I am using for
loop, as follow:
# below is the sample data structure
all.data <- data.frame( NUM_A = 1:5, NAME_A = c("Andy", "Andrew", "Angus",
"Alex", "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",...