Zig-zag matrix: Difference between revisions
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→{{header|J}}: restate "edge cases" comment for clarity.
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(Also, of course, <code>($ [: /:@; <@|.`</.@i.)@,~0</code> creates a result with 0 rows and 0 columns. And, with an argument of 1, the result has one row and one column with the value <code>0</code>. And, the other expressions behave the same.)
Furthermore, by simply ''removing'' the trailing <tt>@,~</tt>
from the solutions, they automatically generalize
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