From: Eli Zaretskii <eliz@gnu.org>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: jay.p.belanger@gmail.com, emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] master 2667d5c: Add new functions for the root mean square of a (Calc) vector
Date: Wed, 16 Sep 2015 17:31:48 +0300 [thread overview]
Message-ID: <83k2rq77vv.fsf@gnu.org> (raw)
In-Reply-To: <jwv613ay02p.fsf-monnier+emacsdiffs@gnu.org>
> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Date: Wed, 16 Sep 2015 09:21:40 -0400
> Cc: Jay Belanger <jay.p.belanger@gmail.com>
>
> -*- mode: nit-pick -*-
>
> > +Another commonly used mean, the RMS (root-mean-square), can be computed
> > +for a vector of numbers by using the @kbd{u R}
>
> I must admit that I don't use Calc very often, and read its manual even
> less often, so clearly I'm taking this out of context, but in any case:
>
> To me a "vector" has a rather specific meaning, and taking the root mean
> square of a vector doesn't make much sense. Instead, I like to take the
> rms of a *set* of numbers (which may be provided by packaging them in
> a vector, of course).
As long as we are nit-picking, the result of root-mean-square
generally depends on the order of the values (due to finite precision
of FP calculations). So it's not really an unordered set.
next prev parent reply other threads:[~2015-09-16 14:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20150916005352.1277.32898@vcs.savannah.gnu.org>
[not found] ` <E1Zc0yu-0000LD-Ah@vcs.savannah.gnu.org>
2015-09-16 13:21 ` [Emacs-diffs] master 2667d5c: Add new functions for the root mean square of a (Calc) vector Stefan Monnier
2015-09-16 13:46 ` David Kastrup
2015-09-16 14:14 ` Stefan Monnier
2015-09-16 13:55 ` Jay Belanger
2015-09-16 14:31 ` Eli Zaretskii [this message]
2015-09-16 14:52 ` David Kastrup
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