The current syntax of CONCATENATE() is CONCATENATE (text1,text2,...).
Using it thus: CONCATENATE(A1:C3) is impossible. Of course, one should think
of the order in which the cells are concatenated, since the case is different
than that of SUM, AVERAGE or PRODUCT due to the concatenation's lack of
commutability.
In order not to mess up the existing function, I suggest a new function with
this syntax:
CONCATRANGE(range, order1, order2, order3)
range - the range of cells to be concatenated
order1 - 0 or omitted for concatenating row after row, 1 for concatenating
column after column.
order2 - 0 or omitted for concatenating rows with the sheet's direction (as
the column letters increase), 1 for concatenating rows in the reverse order
(as the column letters decrease).
order3 - 0 or omitted for concatenating columns with the sheet's direction
(as the row numbers increase), 1 for concatenating columns in the reverse
order (as the row numbers decrease).
Example:
=CONCATRANGE(A1:B3, 1, 0, 1) is equivalent to =A2&A1&B2&B1&C2&C1.

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