Re: Possible bug with new \partial

[David Kastrup]

Simon Albrecht  writes:

> Hello Mats,
>
> IIUC \partial serves to insert an additional amount of time,

Nope.

> however in this example we actually need to skip a beat – thus call
> \partial with a negative duration, which is impossible :-) So you need
> to insert \set Timing.measureLength = #(ly:make-moment 3/4) before the
> second bar in your example.  Is this documented differently?

Yes.  Manually setting Timing.measureLength should never be required.
\partial does pretty much the same except with some synchronization in
order to work sensibly with multiple occurences of \partial while still
warning about bad uses.

-- 
David Kastrup

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Re: Possible bug with new \partial

[Trevor Daniels]

Mats Bengtsson, you wrote Sunday, August 16, 2015 9:55 PM
Subject: Re: Possible bug with new \partial


 My apologies for spamming the mailing list. After some more trials, I 
 realize that the problem remains even if I write \partial after \time. 
 Still, the problem only appears with multimeasure rests, as the two 
 following examples illustrate:
 
 \version 2.19.25
 % Working example
 \relative c'{
 \time 2/4
 \partial 4
 c4 |
 d8 e f g |
 f4
 \bar ||
 \time 3/4
 \partial 4*0
 %R2.*3 |
 f4 ( a f ) |
 f2.
 }
 
 % Failing example
 \relative c'{
 \time 2/4
 \partial 4
 c4 |
 d8 e f g |
 f4
 \bar ||
 \time 3/4
 \partial 4*0
 R2.*3 |
 f4 ( a f ) |
 f2.
 }

Thanks Mats.  Nice to see you're still in the pond!

https://code.google.com/p/lilypond/issues/detail?id=4567

Trevor
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Re: Possible bug with new \partial

[Trevor Daniels]

Mats,

Here's a workaround, although I bet you already have one:

\relative c'{
\time 2/4
\partial 4
c4 |
d8 e f g |
f4*2
\bar ||
\time 3/4
R2.*3 |
f4 ( a f ) |
f2.
}

Trevor


 
 My apologies for spamming the mailing list. After some more trials, I 
 realize that the problem remains even if I write \partial after \time. 
 Still, the problem only appears with multimeasure rests, as the two 
 following examples illustrate:
 
 \version 2.19.25
 % Working example
 \relative c'{
 \time 2/4
 \partial 4
 c4 |
 d8 e f g |
 f4
 \bar ||
 \time 3/4
 \partial 4*0
 %R2.*3 |
 f4 ( a f ) |
 f2.
 }
 
 % Failing example
 \relative c'{
 \time 2/4
 \partial 4
 c4 |
 d8 e f g |
 f4
 \bar ||
 \time 3/4
 \partial 4*0
 R2.*3 |
 f4 ( a f ) |
 f2.
 }
 
 
/Mats
 
 
 
 
 
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Re: Possible bug with new \partial

[Simon Albrecht]

Hello Mats,

IIUC \partial serves to insert an additional amount of time, however in 
this example we actually need to skip a beat – thus call \partial with a 
negative duration, which is impossible :-)
So you need to insert \set Timing.measureLength = #(ly:make-moment 3/4) 
before the second bar in your example.
Is this documented differently? Else I wouldn’t consider it a bug, 
rather an inherent limitation.


Yours, Simon

Am 16.08.2015 um 21:28 schrieb Mats Bengtsson:

Hi,

I tried version 2.19.25 to typeset a piece that changes from 4/4 with 
an upbeat to 3/4 without an upbeat, in the middle of the piece. The 
new \partial handling worked for all parts, except a part that started 
with a multimeasure rest. Here's a small example illustrating the 
problem. Uncommenting the \bar line makes things slightly better but 
still wrong.

\version 2.19.25
\relative c'{
\time 4/4
\partial 4
c |
d e f g |
f2.
%\bar ||
\partial 4*0
\time 3/4
R2.*3 |
f4 ( a f ) |
f2.
R2.*3 |
}


   /Mats


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Re: Possible bug with new \partial

[Simon Albrecht]

Am 16.08.2015 um 22:32 schrieb Mats Bengtsson:



On 08/16/2015 10:05 PM, Simon Albrecht wrote:

Hello Mats,

IIUC \partial serves to insert an additional amount of time, however 
in this example we actually need to skip a beat – thus call \partial 
with a negative duration, which is impossible :-)
So you need to insert \set Timing.measureLength = #(ly:make-moment 
3/4) before the second bar in your example.
Is this documented differently? Else I wouldn’t consider it a bug, 
rather an inherent limitation.
Please note that \partial has been changed very recently in the 2.19 
versions. The documentation for 2.19.25, 
http://lilypond.org/doc/v2.19/Documentation/notation/displaying-rhythms#index-_005cpartial-1 
says that the duration specifies the remaining length of the current 
measure, which in my example is zero.

You’re right of course. I should’ve looked there.
Note also that my example works fine if I remove the R2*3 line 
directly below \time 3/4.

Not quite: no (default) bar line is drawn.
Apparently, the crucial sentence is the last one in the NR section: ‘The 
|\partial| command sets the |Timing.measurePosition| property, which is 
a rational number that indicates how much of the measure has passed.’
I had tried to set measurePosition directly, but when used immediately 
before the new \time, neither 0 nor 4/4 worked as values.
What does work as expected is inserting \partial 2. at the beginning of 
bar 2, so probably we should document that the ‘remaining length of the 
current measure’ given through \partial can’t be zero.


Yours, Simon



/Mats


Yours, Simon

Am 16.08.2015 um 21:28 schrieb Mats Bengtsson:

Hi,

I tried version 2.19.25 to typeset a piece that changes from 4/4 
with an upbeat to 3/4 without an upbeat, in the middle of the piece. 
The new \partial handling worked for all parts, except a part that 
started with a multimeasure rest. Here's a small example 
illustrating the problem. Uncommenting the \bar line makes things 
slightly better but still wrong.

\version 2.19.25
\relative c'{
\time 4/4
\partial 4
c |
d e f g |
f2.
%\bar ||
\partial 4*0
\time 3/4
R2.*3 |
f4 ( a f ) |
f2.
R2.*3 |
}


   /Mats


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Re: Possible bug with new \partial

[Mats Bengtsson]

On 08/16/2015 10:05 PM, Simon Albrecht wrote:

Hello Mats,

IIUC \partial serves to insert an additional amount of time, however 
in this example we actually need to skip a beat – thus call \partial 
with a negative duration, which is impossible :-)
So you need to insert \set Timing.measureLength = #(ly:make-moment 
3/4) before the second bar in your example.
Is this documented differently? Else I wouldn’t consider it a bug, 
rather an inherent limitation.
Please note that \partial has been changed very recently in the 2.19 
versions. The documentation for 2.19.25, 
http://lilypond.org/doc/v2.19/Documentation/notation/displaying-rhythms#index-_005cpartial-1 
says that the duration specifies the remaining length of the current 
measure, which in my example is zero. Note also that my example works 
fine if I remove the R2*3 line directly below \time 3/4.


/Mats


Yours, Simon

Am 16.08.2015 um 21:28 schrieb Mats Bengtsson:

Hi,

I tried version 2.19.25 to typeset a piece that changes from 4/4 with 
an upbeat to 3/4 without an upbeat, in the middle of the piece. The 
new \partial handling worked for all parts, except a part that 
started with a multimeasure rest. Here's a small example illustrating 
the problem. Uncommenting the \bar line makes things slightly better 
but still wrong.

\version 2.19.25
\relative c'{
\time 4/4
\partial 4
c |
d e f g |
f2.
%\bar ||
\partial 4*0
\time 3/4
R2.*3 |
f4 ( a f ) |
f2.
R2.*3 |
}


   /Mats


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--
=
Mats Bengtsson
Signal Processing
School of Electrical Engineering
Royal Institute of Technology (KTH)
SE-100 44  STOCKHOLM
Sweden
Phone: (+46) 8 790 8463 
Fax:   (+46) 8 790 7260
Email: mats.bengts...@ee.kth.se
WWW: http://www.ee.kth.se/~mabe
=


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Re: Possible bug with new \partial

[Mats Bengtsson]

My apologies for spamming the mailing list. After some more trials, I 
realize that the problem remains even if I write \partial after \time. 
Still, the problem only appears with multimeasure rests, as the two 
following examples illustrate:


\version 2.19.25
% Working example
\relative c'{
\time 2/4
\partial 4
c4 |
d8 e f g |
f4
\bar ||
\time 3/4
\partial 4*0
%R2.*3 |
f4 ( a f ) |
f2.
}

% Failing example
\relative c'{
\time 2/4
\partial 4
c4 |
d8 e f g |
f4
\bar ||
\time 3/4
\partial 4*0
R2.*3 |
f4 ( a f ) |
f2.
}


   /Mats





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Re: Possible bug with new \partial

[Mats Bengtsson]

I just realized that if i swap \partial and \time, it works as expected, 
at least if I explicitly specify the bar line:

\version 2.19.25
\relative c'{
\time 4/4
\partial 4
c |
d e f g |
f2.
\bar ||  %Removing this line still gives ugly collisions!
\time 3/4
\partial 4*3
R2.*3 |
f4 ( a f ) |
f2.
R2.*3 |
}

In a way, this is logical, since the \partial relates to the new time 
signature, not the previous one. Still, I'm confused that the problem 
only showed up when using a multimeasure rest directly after the \partial.


/Mats


On 08/16/2015 10:32 PM, Mats Bengtsson wrote:



On 08/16/2015 10:05 PM, Simon Albrecht wrote:

Hello Mats,

IIUC \partial serves to insert an additional amount of time, however 
in this example we actually need to skip a beat – thus call \partial 
with a negative duration, which is impossible :-)
So you need to insert \set Timing.measureLength = #(ly:make-moment 
3/4) before the second bar in your example.
Is this documented differently? Else I wouldn’t consider it a bug, 
rather an inherent limitation.
Please note that \partial has been changed very recently in the 2.19 
versions. The documentation for 2.19.25, 
http://lilypond.org/doc/v2.19/Documentation/notation/displaying-rhythms#index-_005cpartial-1 
says that the duration specifies the remaining length of the current 
measure, which in my example is zero. Note also that my example works 
fine if I remove the R2*3 line directly below \time 3/4.


/Mats


Yours, Simon

Am 16.08.2015 um 21:28 schrieb Mats Bengtsson:

Hi,

I tried version 2.19.25 to typeset a piece that changes from 4/4 
with an upbeat to 3/4 without an upbeat, in the middle of the piece. 
The new \partial handling worked for all parts, except a part that 
started with a multimeasure rest. Here's a small example 
illustrating the problem. Uncommenting the \bar line makes things 
slightly better but still wrong.

\version 2.19.25
\relative c'{
\time 4/4
\partial 4
c |
d e f g |
f2.
%\bar ||
\partial 4*0
\time 3/4
R2.*3 |
f4 ( a f ) |
f2.
R2.*3 |
}


   /Mats


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--
=
Mats Bengtsson
Signal Processing
School of Electrical Engineering
Royal Institute of Technology (KTH)
SE-100 44  STOCKHOLM
Sweden
Phone: (+46) 8 790 8463 
Fax:   (+46) 8 790 7260
Email: mats.bengts...@ee.kth.se
WWW: http://www.ee.kth.se/~mabe
=


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