Arc Forumnew | comments | leaders | submitlogin
2 points by bOR_ 6002 days ago | link | parent

Had tried apply, but that doesn't work in arc2. I get a

  "Function call on inappropriate object #3(tagged mac #<procedure>) (1 2 3)"
Might be inevitable for me to move over towards anarki, if it works there. :P


3 points by absz 6002 days ago | link

Actually, in looking over the functions again, it turns out that there is already a function that does what you want: random-elt. That should do what you need it to do.

As for your problem (and no, it doesn't work on Anarki[1]), the problem is that rand-choice is a macro, not a function, and apply only works on functions. The only solution is a terrible hack:

  (def mapply (macro . parms)
    " Applies the macro `macro' to `parms', which are not quoted.
      See also [[mac]] [[apply]] "
    (eval:apply (rep macro) (join (butlast parms) (last parms))))
But don't use that!

[1]: But you should use Anarki anyway :)

-----

2 points by bOR_ 6002 days ago | link

Thanks for the reminder not to apply on macro's, and for finding random-elt. I need to learn how to read ;).

random-elt does exactly what I want.

(btw.. small consistency issue in the syntax here?) rand-choice random-elt

-----