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comp / comp.lang.lisp / Re: The LOOP macro

SubjectAuthor
* Re: The LOOP macroB. Pym
`- Re: The LOOP macroB. Pym

1
Subject: Re: The LOOP macro
From: B. Pym
Newsgroups: comp.lang.lisp
Organization: A noiseless patient Spider
Date: Mon, 5 Aug 2024 04:53 UTC
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Nobody447095@here-nor-there.org (B. Pym)
Newsgroups: comp.lang.lisp
Subject: Re: The LOOP macro
Date: Mon, 5 Aug 2024 04:53:00 -0000 (UTC)
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> > > Do you have a good example of LOOP's power / flexibility that doesn't
> > > need much surrounding context to understand?
> >
> > Here are a few:
> >
> > (loop repeat 100 collect (random 10))

newLISP

(collect (rand 10) 100)

> > (loop for x across array-of-numbers
> > minimizing x into min
> > maximizing x into max
> > summing x into total
> > counting t into count
> > finally (return (list min max (/ total count))))

(define array-of-numbers (array 9 '(2 -2 0 9 7 8 3 4 3)))

(local (mx mn total cnt)
(dolist (n array-of-numbers)
(setq mx (max (or mx n) n))
(setq mn (min (or mn n) n))
(++ total n)
(++ cnt))
(list mn mx (div total cnt)))

(-2 9 3.777777777777778)

Another way:

(list (apply min array-of-numbers)
(apply max array-of-numbers)
(div (apply + array-of-numbers) (length array-of-numbers)))

Subject: Re: The LOOP macro
From: B. Pym
Newsgroups: comp.lang.lisp
Organization: A noiseless patient Spider
Date: Mon, 5 Aug 2024 18:18 UTC
References: 1
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From: Nobody447095@here-nor-there.org (B. Pym)
Newsgroups: comp.lang.lisp
Subject: Re: The LOOP macro
Date: Mon, 5 Aug 2024 18:18:22 -0000 (UTC)
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B. Pym wrote:

> > > > Do you have a good example of LOOP's power / flexibility that doesn't
> > > > need much surrounding context to understand?
> > >
> > > Here are a few:
> > >
> > > (loop repeat 100 collect (random 10))
>
>
> newLISP
>
> (collect (rand 10) 100)
>
>
>
> > > (loop for x across array-of-numbers
> > > minimizing x into min
> > > maximizing x into max
> > > summing x into total
> > > counting t into count
> > > finally (return (list min max (/ total count))))
>
>
> (define array-of-numbers (array 9 '(2 -2 0 9 7 8 3 4 3)))
>
> (local (mx mn total cnt)
> (dolist (n array-of-numbers)
> (setq mx (max (or mx n) n))
> (setq mn (min (or mn n) n))
> (++ total n)
> (++ cnt))
> (list mn mx (div total cnt)))
>
> (-2 9 3.777777777777778)
>
> Another way:
>
> (list (apply min array-of-numbers)
> (apply max array-of-numbers)
> (div (apply + array-of-numbers) (length array-of-numbers)))

Another way:

(list (apply min array-of-numbers)
(apply max array-of-numbers)
((stats array-of-numbers) 1))

(-2 9 3.777777777777778)

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