RE: How to split autobeam

[Gerard L. Maters]

Hello Gilles, 

Thanks again for your reply and for putting me in the right direction! 

Considering your question: "why use the <<...>> construct?": it was the only
way of getting an error-free compilation of the composition. 

Your question however triggered something and after a while I noticed a
minor difference in my notation. I added the duration of the notes of the
chord to the first note of the chord, so within the <<..>>. In that case
compilation only is error-free using the double marks <<..>>. And then
obviously the [<<..>> <..>>] construct is not valid. 

I moved the duration of the notes outside the marks using the single marks
<..> and now it works fine! 

Thanks again. 

Gerard 

-----Oorspronkelijk bericht----- 

Van: address@hidden
[mailto:address@hidden Namens Gilles
Sadowski 

Verzonden: maandag 15 september 2008 20:45 

Aan: address@hidden 

Onderwerp: Re: How to split autobeam 

Hi. 

> Here's one example that produces the wrong beaming: 

> 

> right = \context Voice = "discant" 

> 

> { 

> 

> \clef violin 

> 

> \time 4/4 

> 

> \relative b' { <<b8. d fis b>> <<bes,16 d f bes>> <<b,8 d fis b>> 

> <<b,8 d fis b>> 

> 

> <<cis,8 eis gis cis>> <<cis,8 eis gis cis>> <<d,8 f a d>> <<d,8 f a 

> d>> }| 

> 

> } 

Hmm, this is still not a complete code: The \score part is missing. 

Why do you use the << ... >> construct? A chord is created with something
like 

<c e g>4 

I.e. with single brackets. Also, the duration is specified after the closing
bracket. 

> The compiler produces the correct beaming between the b8. and bes,16 

> chord and between the two b,8 chords. 

> 

> With the default auto-beam setting the next 4 chords are beamed 

> together. In this case the cis,8 chords should 

> 

> Be beamed together and the two d,8 chords should be beamed. 

You didn't tell why the solution I proposed does not satisfy your needs.
Similarly to my previous post, your code above can turned into: 

%--- 

right = \context Voice = "discant"{ 

\clef violin 

\time 4/4 

\relative b' { 

<b d fis b>8. <bes d f bes>16 <b d fis b>8 <b, d fis b>8 

<cis eis gis cis>8[ <cis eis gis cis>8] <d f a d>8[ <d f a d>8] | 

} 

} 

\score { 

\right 

} 

%--- 

See attached pdf. 

> I've tried severla options, for example adding \nobeam to the first 

> d,8 chord. As a result the last two chords are 

> 

> Beamed together, but the first two chords (cis,8) are then separated, 

> not beamed. 

I agree that this behaviour looks strange. Maybe someone else can give an
explanation or confirm that this is a bug. 

> Also tried overriding the default auto-beam, but that didnot produce 

> the correct result (yet). 

In this, I guess that the default behaviour should be what you expect,
without resorting to this. 

> Hope you can help or point me in the direction where to look for a 

> solution. 

Again, what's wrong with using square (beaming) brackets? Something like 

a8[ b] c[ d] 

produces the right result. 

Gilles 


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