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## Re: [Emacs-diffs] master 2667d5c: Add new functions for the root mean sq

**From**: |
Eli Zaretskii |

**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 |

>* From: Stefan Monnier <address@hidden>*
>* Date: Wed, 16 Sep 2015 09:21:40 -0400*
>* Cc: Jay Belanger <address@hidden>*
>* *
>* -*- 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.