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nilforooshan/datatable_column_as_vector.md

Created March 11, 2024 21:15
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R: Three ways of extracting a data.table column as a vector
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datatable_column_as_vector.md

Three ways of extracting a data.table column as a vector

DT = data.table(
    ID = c("b","b","b","a","a","c"),
    a = 1:6,
    b = 7:12,
    c = 13:18
)
DT[[1]]
DT$ID
DT[,ID]
[1] "b" "b" "b" "a" "a" "c"
[1] "b" "b" "b" "a" "a" "c"
[1] "b" "b" "b" "a" "a" "c"
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