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From: | Dr . Jürgen Sauermann |
Subject: | Re: Support for 'where' primitive '⍸' ? |
Date: | Fri, 27 Nov 2020 14:42:25 +0100 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
Hi, newbie to APL so my sincere apologies in advance if this is incorrect, an FAQ, or by design (intentionally not implemented).
Dyalog APL appears to support monadic ⍸ (underscore-iota) primitive as a 'where' function, eg.
b ← 0 0 1 1 0⍸b3 4
..whereas GNU APL considers the ⍸ as an invalid symbol (SYNTAX ERROR)
Equivalent seems to beb / ⍳⍴ b3 4
.. just wondering if this is a Dyalog non-standard and if GNU APL plans to implement it.
Thanks,-Russ
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