R : data.table `:=` assignment expressions with dynamic inputs (existing columns) and outputs (new c
R : data.table `:=` assignment expressions with dynamic inputs (existing columns) and outputs (new column names)
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R : data.table `:=` assignment expressions with dynamic inputs (existing columns) and outputs (new column names)
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dynamic column outputs (new `:=` expressions R names) columns) inputs : (existing data.table and assignment with