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: Wed, 01 Oct 2008 18:46:02 +0200 [thread overview]
Message-ID: <87y718nu0l.fsf@selenimh.orion.org> (raw)
In-Reply-To: <9136F031-BBCD-4A80-A117-6047C5D3F777@uva.nl> (Carsten Dominik's message of "Mon, 29 Sep 2008 10:43:14 +0200")
Carsten Dominik <dominik@uva.nl> writes:
Hello,
> Hi Nicolas, there s no builtin way to deal with this, in particular
> with the fact that you want to treat empty fields as non-existing, and
> therefore also to ignore the corresponding weight.
>
> You cou write a Lisp function to do this, though:
>
> (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)))))
> (/ vsum wsum)))
Well, thank you very much: it does the job.
I don't want to be picky but I'll investigate on a way to have an empty
string instead of a sorry 0 whenever a student hasn't sat for any exam.
Finally, I wondered if it would be useful to make it built-in as
weighted means are somewhat popular in education.
Anyway, thanks again.
--
Nicolas Goaziou
next prev parent reply other threads:[~2008-10-01 16:50 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 [this message]
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
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