Re: \oneVoice and \voiceXX commands having the wrong scope

[Mats Bengtsson]

I think you have not fully realized how <<{...} \\ {...}>> works.
Your first example is equivalent to

\new Staff {
    \clef bass
    \context Voice="1" {
        \oneVoice
        c'2-\markup {\column < "oneVoice" "(This markup generates a 
programming  error)">} r2 |
        << \context Voice = "1" {\voiceOne b2-"Polyphony" r2}
           \context Voice = "2" {\voiceTwo g2 r2} >>
        c'2-"oneVoice should still be in effect here." r2 |
    } |
}

Since you have the same name "1" for your main voice as is implicitly
given to the upper voice by <<{...} \\ {...}>> and since a context is
uniquely determined by its name, they are actually the same voice, so
any setting that is done within the upper voice of the
<<{...} \\ {...}>> will remain after the polyphonal part.
Of course, if you give another name than "1" to your main Voice context,
your examples will work as you expect.

   /Mats

Yuval Harel wrote:
> \oneVoice scope too short:
> ==========================
>
> \version "2.4.2"
>
> \new Staff {
>     \clef bass
>     \context Voice="1" {
>         \oneVoice
>         c'2-\markup {\column < "oneVoice" "(This markup generates a 
> programming  error)">} r2 |
>         << {b2-"Polyphony" r2} \\ {g2 r2} >>
>         c'2-"oneVoice should still be in effect here." r2 |
>     } |
> }
>
> \voiceOne scope too long:
> =========================
>
> \version "2.4.2"
>
> \new Staff {
>     \clef bass
>     c'2 r2    |    % commenting out this line eliminates the problem
>     << {\voiceOne r1-"voiceOne"} >> |
>     c'2-"voiceOne is still in effect" r2
>     \oneVoice
>     r1-\markup {\column <"oneVoice" "(This markup generates a 
> programming  error)">} |
> }
>
> On Wed, 26 Jan 2005 00:22:14 +0100, Erik Sandberg  
> <address@hidden> wrote:
>
> > On Tuesday 25 January 2005 15.03, Yuval Harel wrote:
> >
> > > Hi,
> > >
> > > I found that \oneVoice and \voiceOne sometimes have unexpected effects.
> > > Here are two examples which might be two separate bugs.
> > > When preparing the examples I also noticed that adding markup can
> > > sometimes generate programming errors in these
> > > situations.
> >
> >
> > The mailing list strips attachments. Could you please resend it, 
> > pasted  into
> > the message?
> >
> > Erik
>
>
>
>
>
>
> _______________________________________________
> lilypond-user mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/lilypond-use
> r

--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
        Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================