> From: [email protected] > > Taking that last description literally, you can (once again) let J > figure out how to de-itemize, given that itemize (monadic ,:) > and inverse are easily at hand: > > inv =. ^: _1 > ,: inv i. 2 3 4 > 0 1 2 3 > 4 5 6 7 > 8 9 10 11 > $ ,: inv i. 2 3 4 > 3 4
Additionally you can ask J what the inverse for ,: is:
,: b. _1
{.
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