It should be 4/19 (the ratio of the old and new bar lengths), and the
affected measure(s) should be enclosed in braces like so:

\new Staff {
    \time 4/4
    \omit Score.TimeSignature
    \scaleDurations 4/19 {
      \repeat unfold 6 { c4 c2 } c4
    }
    R1 \fermataMarkup
}

Since you're hiding time signatures, the \set Staff.timeSignatureFraction
command is superfluous.

HTH,
Evan


On Sun, Aug 7, 2016 at 1:53 PM, Craig Dabelstein <craig.dabelst...@gmail.com
> wrote:

> Hi Lilyponders,
>
> I have a score where there are a couple of cadenzas. I experimented with
> /cadenzaOn /cadenzaOff etc but couldn't get it to work to my liking, with
> the full measure rests in the other bars. This solution below would be
> great if someone could help me get the scale durations line correct (for
> the 19/4 bar)? Any ideas?
>
> All the best,
>
> Craig
>
> %%%%%%%%%
>
> \version "2.19.36"
>
> \relative c' <<
>   \new Staff {
>     \time 4/4
>     R1 \fermataMarkup |
>     R1 \fermataMarkup |
>   }
>   \new Staff {
>     \time 4/4
>     \omit Score.TimeSignature
>     \set Staff.timeSignatureFraction = 19/4
>     \scaleDurations 1/5
>     \repeat unfold 6 { c4 c2 } c4
>     \set Staff.timeSignatureFraction = 4/4
>     R1 \fermataMarkup
>   }
>
> >>
>
> %%%%%%%
>
>
> *Craig Dabelstein*
> e:craig.dabelst...@gmail.com
> <http://www.facebook.com/craig.dabelstein>
> <http://au.linkedin.com/pub/craig-dabelstein/b2/5b8/389/en>
>
> _______________________________________________
> lilypond-user mailing list
> lilypond-user@gnu.org
> https://lists.gnu.org/mailman/listinfo/lilypond-user
>
>
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