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   Tariq (rzeta0@mastodon.social)'s status on Monday, 17-Mar-2025 17:23:13 JST Tariq

   I need some #lisp help.

   I'm stuck on a recursion exercise - have been for 2 days!

   We're given a at a structure a list of lists, where each such list is of the form (person mother father) .. and so a lot of these together create a family tree.

   I want to write a function lineage x y which returns a list of ancestors from x to y ... eg x, mother of x, father of prev, y .... or NIL if y is not an ancestor of x.

   I found this easy in #prolog (I wrote this https://prologbyexample.blogspot.com/2023/02/introducing-recursion.html ) but not #lisp.

   • Embed this notice
     Christine Lemmer-Webber (cwebber@social.coop)'s status on Monday, 17-Mar-2025 17:23:13 JST Christine Lemmer-Webber

     in reply to

     @rzeta0 https://sarabander.github.io/sicp/html/4_002e4.xhtml#g_t4_002e4

     https://minikanren.org/