Feature #6852
Updated by nobu (Nobuyoshi Nakada) 9 months ago
```ruby p = [1, 2, 3] q = [4, 5, 6] [p, q].transpose # => [[1, 4], [2, 5], [3, 6]] ``` As expected, 2 x 3 vector was converted into 3 x 2. ```ruby [p].transpose # => [[1], [2], [3]] ``` As expected, 1 x 3 => 3 x 1. ```ruby [].transpose # => [] ``` Unexpected, 0 x 3 did not become 3 x 0: [[], [], []] In other words, when `[]` [] is the receiver, transpose has no way to know what kind of **2 dimensional** ** 2 dimensional ** object is it - whether 0 x 3, 0 x 4, 0 x 1 or perhaps 0 x 0. `#transpose` #transpose should not assume it is 0 x 0. It should raise, or warn, or complain, or require argument for this case, in short, it should behave differently than today.