As a general proposition, I would worry about this construct -- in particular I would worry whether @column could be changed later, generating side effects in the @sheet array.
You seem to assume that isn't what the OP wanted. Sometimes that's exactly why \@columns must be used over [ @columns ].

The OP was sufficiently vague that neither of us could have guessed at what they wanted.

In reply to Re^3: One Dimensional Array into Two by FunkyMonk
in thread One Dimensional Array into Two by JoeJaz

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