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Re: Problems with \inversion

From: David Kastrup
Subject: Re: Problems with \inversion
Date: Tue, 19 Jun 2012 11:57:41 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux)

"Trevor Daniels" <address@hidden> writes:

> Colin Hall wrote Tuesday, June 19, 2012 1:12 AM
>> It looks like the behaviour has been explained by David Kastrup here:
>> http://lists.gnu.org/archive/html/lilypond-user/2012-06/msg00380.html
>> So, no bug in Lilypond to report then.
> Correct.
>> If either of you, Alexandre or Trevor, would care to create a
>> documentation suggestion we'll create a tracker for it.
> OK.  There are two points here.  The first is that it is not
> immediately obvious that the inversion takes place around
> from-pitch, and the result is then transposed by the interval
> between from-pitch and to-pitch.  So simply change the
> second sentence to "... first inverted interval by interval about
> from-pitch and then ..."
> The second point is to insert a warning that the inversion of a music
> expression in absolute notation should not later be relativised.
> Maybe say, "The source and inverted music expressions should
> both be in absolute notation or both in relative notation."  This
> is not entirely the whole story, but anything more accurate gets
> very convoluted - unless anyone has a better suggestion.

"Both in relative notation" is asking for trouble.  I'd strongly suggest
only inverting absolute music, and the result of \relative ... _is_
absolute music.

David Kastrup

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