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If I create a Tabular like this one, how can I use TransformColumns (or other command) to add a column that has the value of the row number i.e. {1,2,3,4...}

t = Tabular[{{1, 7, 4}, {4, 5, 6}, {7, 8, 9}}, {"a", "b", "c"}]
TransformColumns[t, "RowNum"-> ?]

so that the table becomes

{{1, 7, 4}, {4, 5, 6}, {7, 8, 9}}, {"a", "b", "c"}, {1, 2, 3}}?
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2 Answers 2

Reset to default
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Another idea is to insert the column:

t = Tabular[{{1, 7, 4}, {4, 5, 6}, {7, 8, 9}}, {"a", "b", "c"}];
InsertColumns[t, "RowNum" -> Range[Length[t]]]
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Using ColumnwiseThread

t = Tabular[{{1, 7, 4}, {4, 5, 6}, {7, 8, 9}}, {"a", "b", "c"}];
TransformColumns[t, "RowNum" -> (ColumnwiseThread[Range@Length@t] &)]

row number

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