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From: Nicolas Goaziou <n.goaziou@neuf.fr>
To: Carsten Dominik <dominik@uva.nl>
Cc: emacs-orgmode@gnu.org
Subject: Re: Spreadsheet and weighted means
Date: Sat, 04 Oct 2008 10:49:46 +0200	[thread overview]
Message-ID: <87r66w9239.fsf@selenimh.orion.org> (raw)
In-Reply-To: <CDC9DB57-9952-4008-8363-69CF0467E8FB@uva.nl> (Carsten Dominik's message of "Wed, 01 Oct 2008 21:26:37 +0200")

Hello,

Carsten Dominik <dominik@uva.nl> writes:

> (defun my-wmean (values weights)
>  (let ((vsum 0) (wsum 0))
>    (while (and values weights)
>      (setq v (pop values) w (pop weights))
>      (unless (equal "" v)
> 	(setq vsum (+ vsum (* (string-to-number w) (string-to-number
> v)))
> 	      wsum (+ wsum (string-to-number w)))))
>    (if (= vsum 0) "" (format "%.1f" (/ vsum wsum)))))

But in this case, there's no difference between one who didn't work and
one who just wasn't there: 0 0 and "empty" "empty" will have the same
"empty" mean, won't they ?

>> Finally, I wondered if it would be useful to make it built-in as
>> weighted means are somewhat popular in education.
>
> Well, I could do that, of course. But which version of this function?
> What ouput etc?
> I guess this would then be the original version, which returns a
> number, and which returns 0 if the student has done absolutely
> nothing....

Though it seems more of a rhetorical question, I would be tempted to
answer that any of them would be useful.
On the other hand, I can live with "my-wmean" in my .emacs.

Regards,

-- 
Nicolas Goaziou

      parent reply	other threads:[~2008-10-04  8:53 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-20  7:00 Spreadsheet and weighted means Nicolas Goaziou
2008-09-29  8:43 ` Carsten Dominik
2008-09-29  8:44   ` Carsten Dominik
2008-10-01 16:46   ` Nicolas Goaziou
2008-10-01 19:26     ` Carsten Dominik
2008-10-01 19:45       ` Embedded elisp formulas, was: " Eric Schulte
2008-10-01 20:29         ` Paul R
2008-10-02  0:03           ` Eric Schulte
2008-10-02 11:44             ` Carsten Dominik
2008-10-08 23:12               ` ANN: org-eval-light.el was: " Eric Schulte
2008-11-06  1:19               ` Eric Schulte
2008-11-09  7:02                 ` Carsten Dominik
2008-11-10 19:51                   ` Daniel Clemente
2008-10-04  8:49       ` Nicolas Goaziou [this message]

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