@flatten(t:tab)
@flatten(t:tab, n:numeric)

flatten(t) returns a new tab where where the nesting structure of t has been flattened. For example,

       @flatten([[1, 2], [3], [[], [4, 5]]]) ->  [1, 2, 3, 4, 5]

flatten(t, n) returns a new tab where the first n levels of nesting have been flattened. If n == 0, the function is the identity. If n is strictly negative, it is equivalent to without the level argument.

       @flatten([1, [2, [3, 3], 2], [[[4, 4, 4]]]], 0)  -> [1, [2, [3, 3], 2], [[[4, 4, 4]]]]
       @flatten([1, [2, [3, 3], 2], [[[4, 4, 4]]]], 1)  -> [1, 2, [3, 3], 2, [[4, 4, 4]]]
       @flatten([1, [2, [3, 3], 2], [[[4, 4, 4]]]], 2)  -> [1, 2, 3, 3, 2, [4, 4, 4]]
       @flatten([1, [2, [3, 3], 2], [[[4, 4, 4]]]], 3)  -> [1, 2, 3, 3, 2, 4, 4, 4]
       @flatten([1, [2, [3, 3], 2], [[[4, 4, 4]]]], 4)  -> [1, 2, 3, 3, 2, 4, 4, 4]
       @flatten([1, [2, [3, 3], 2], [[[4, 4, 4]]]], -1) -> [1, 2, 3, 3, 2, 4, 4, 4]

See also some other lisp like functions: @car, @cdr, @concat, @cons, @empty, @drop, @take.

See also Tab Related Functions @car,    @cdr,    @clear,    @concat,    @cons,    @copy,    @count,    @dim,    @domain,    @drop,    @empty,    @explode,    @find,    @flatten,    @gnuplot,    @insert,    @iota,    @is_list,    @is_prefix,    @is_subsequence,    @is_suffix,    @lace,    @last,    @listify,    @map,    @max_val,    @median,    @member,    @normalize,    @occurs,    @permute,    @push_back,    @push_front,    @range,    @reduce,    @remove,    @remove_duplicate,    @replace,    @resize,    @reverse,    @rotate,    @scan,    @scramble,    @size,    @slice,    @sort,    @sputter,    @stutter,    @tab_history,    @tab_history_date,    @tab_history_rdate,    @take