[Lilypond-auto] Issue 4338 in lilypond: Octavecheck - unexpected behavior

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Documentation

New issue 4338 by address@hidden: Octavecheck - unexpected behavior
https://code.google.com/p/lilypond/issues/detail?id=4338

Nik Repka, Abraham Lee, Joram, and Trevor Daniels wrote :

> \relative c'' {
>    c4 f g f

>    c4
>    \octaveCheck c'
>    f
>    \octaveCheck c'
>    g
>    \octaveCheck c'
>    f
> }

> I understand why the first and third octave checks fail... but I am
> uncertain why the last f (which appears in the output as the f below c')  
> is
> chosen instead of f'.  According to the manual (
> http://lilypond.org/doc/v2.18/Documentation/notation/changing-multiple-pitches),
> "If this [octave] check fails, a warning is printed, but the previous note
> is not changed. Future notes are relative to the controlpitch."  However,  
> f
> below c' is not "relative" to c' since it is a fifth away from c'.  Or  
> have
> I misunderstood what is meant by "relative"?

> Basically, my question is... why do we get f not f'?

-and-

Here is a guess what happens (even if that contradicts the docs):
The following pitches are perhaps not relative to the octave check but
to the previous pitch corrected by the octave check.
I am commenting inside your example:

>      \relative c'' {
>        c4 f g f

>        c4
>        \octaveCheck c'
The c4 is a c'' -> check resets to c' -> following note is f'
>        f
>        \octaveCheck c'
Check passed -> continue relative to f' -> next note is g'
>        g
>        \octaveCheck c'
The g is a g' closer to a c'' -> check resets to g -> next note is f
>        f
>      }

This would explain it, but the docs would have to be corrected.

Btw, the other way to do octave checks seems more intuitive to me:

\relative c'' {
  c4 f g f
  c='4 f=' g='' f
}

-and-

Yes, it's a doc issue.  But is it really useful in this form?
Does anyone use it?

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