Re: [Maxima-discuss] How do I translate "(map 'list f as)" to Maxima?

[Michel T. <ta...@lp...>]

What is the problem with the simpler:

(%i1) map(lambda([x],x+a),[2,3,4]);
(%o1)                        [a + 2, a + 3, a + 4]
(%i2) x:5;
(%o2)                                  5
(%i3) map(lambda([x],x+a),[2,3,4]);
(%o3)                        [a + 2, a + 3, a + 4]
(%i4) a:3;
(%o4)                                  3
(%i5) map(lambda([x],x+a),[2,3,4]);
(%o5)                              [5, 6, 7]

Le 24/10/2023 à 01:24, Eduardo Ochs a écrit :
> Hi list,
>
> what is the right/recommended way to define something like Lisp's
> "map" in Maxima? I tried this,
>
> to_lisp();
>   (defun foo (x) (* x 10))
>   (map 'list 'foo '(2 3 5 8))             ;;-> (20 30 50 80)
>   (to-maxima)
>
> map_list(f, as) := makelist(apply(f, [a]), a, as);
> map_list(lambda([x], 10*x), [2, 3, 5, 8]);  /* [20, 30, 50, 80]     */
> map_list(lambda([x], x+b),  [2, 3, 5, 8]);  /* [b+2, b+3, b+5, b+8] */
> map_list(lambda([x], x+a),  [2, 3, 5, 8]);  /* [4, 6, 10, 16]       */
>
> but it doesn't work well in cases like the last one, in which f
> mentions a global variable with the same name as the variable used in
> the makelist...
>
> Thanks in advance!
>   Cheers =),
>     Eduardo Ochs
>
>
> _______________________________________________
> Maxima-discuss mailing list
> Max...@li...
> https://lists.sourceforge.net/lists/listinfo/maxima-discuss

-- 
Michel Talon