If the question is just "how to get it done", rather than "how to get it done
using } tacitly", then I suggest straightforward selection at rank.
X {"0 1"_1 _ A
0 17 28 39 42 52 65 75 85 93
8 10 20 35 49 56 64 70 86 94
9 18 25 37 44 50 61 72 87 99
3 12 21 32 49 55 63 79 86 99
0 16 23 32 49 51 67 73 85 92
...
-Dan
PS: Because i haven't seen my previous message on this come back yet, the
answer using } tacitly and fixing A is:
X=: 50 10 ?@$ 10
A=:i. 10 10
]`(A"_)}"_1 X
0 71 82 93 24 25 56 57 58 39
80 1 2 53 94 65 46 7 68 49
90 81 52 73 44 5 16 27 78 99
30 21 12 23 94 55 36 97 68 99
> On Mar 30, 2014, at 5:46 PM, Brian Schott <[email protected]> wrote:
>
> Are you familiar with J's Oblique? Your mention of diagonals suggest it to
> me.
>
> http://jsoftware.com/help/dictionary/d421.htm
>
>
>
> --
> (B=)
> ----------------------------------------------------------------------
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