TableDirections is an option for TableForm and MatrixForm which specifies whether successive dimensions should be arranged as rows or columns.
TableDirections -> Column specifies that successive dimensions should be arranged alternately as columns and rows, with the first dimension arranged as columns.
TableDirections -> Row takes the first dimension to be arranged as rows.
TableDirections -> , , ... specifies explicitly whether each dimension should be arranged with Column or Row.
See The Mathematica Book: Section 2.8.8.
See also: TableSpacing.
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