Re: Scheme for rhythmic transposition

[David Kastrup]

"Phil Holmes" <address@hidden> writes:

> \shiftDurations seems to be remaining poorly documented.  I'd be happy
> to update the LSR with that function rather than the way it is now,
> but it seems to me that durations can only be made shorter, not
> longer?  If I use:
>
>    \shiftDurations 1 0 { \music }
>
> all is OK.  However, with
>
>    \shiftDurations -1 0 { \music }
>
> I get:
>
> ShiftDur.ly:11:20: error: wrong type for argument 1.  Expecting
> integer, found #<Prob: Music C++: Music((digit . 1) (origin
> . #<location ShiftDur.ly:11:21>))((display-methods #<procedure #f
> (event parser)>) (name . FingeringEvent) (types general-music
> fingering-event event)) >
>
>    \shiftDurations
>                    -1 0 { \music }
>
> Is this the correct usage, and does this mean that \shiftDurations
> does only shorted music?

1 is an UNSIGNED.  -1 is a fingering.  Hooray.  Try #-1 instead.  I'll
eventually get around to getting the "interpret in the correct manner by
magic" behavior for negative numbers as well, but it has never been in
Lilypond so far.  Actually, historically Lilypond would have balked at 1
as well, calling for #1 instead.  So in a way, your impression is partly
my fault.

-- 
David Kastrup