g=: ''&$ g ,8 8
$g ,8
g i.2 3 4
0 1 2 3
4 5 6 7
8 9 10 11
f=: {. : (4 :'{.^:x y')
(f -: g)&> 2;'abc';i.-4 3 2
1 1 1
0 1 2 (f -: g)&>/ 2;'abc';i.-4 3 2
1 1 1
1 1 1
1 1 1
NB. Is this already in Dan's j synonym collection?
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