Re: Using a variable with \relative

[David Kastrup]

Basso Ridiculoso <address@hidden> writes:

> Is there a way to do something similar to this:
>
>
> \include "english.ly"
>
> x = { c }
> y = { g }
>
> \score {
> <<
> \new Staff {
>     \clef "bass"
>     
>     \relative \x { d e f g a }
>     
>     \relative \y { bf a c d }
>
>     }
>  }

No (and please don't use unbreakable space in examples, since it makes
copy and paste impossible).

Pitches can't be placed into identifiers.

> Perhaps I need to write a function that sends in a variable?

Music functions return music expressions.  The newfangled scheme
functions (did I commit them already?) don't support ly:export (that
would have been real hard to do), and anyway, ly:export only works for
things that can be put into an identifier.

You can't expect \relative \x to work, but you could make \x { ... }
work in itself for making things relative to something.  And
\relative is a noop for unrelativable music.

> How does one dereference a variable inside of a function?
>
> For instance if I sent in \x how do I say "use the value of x"? Or is
> that necessary?

I have no idea what you are talking about.

>
> This doesn't seem to work either

> MyTestFunction =
> #(define-music-function
>      (parser location firstnote secondnote thirdnote fourthnote
> fifthnote sixthnote )
>      ( ly:music? ly:music? ly:music? ly:music? ly:music?  ly:music? )
>    #{    
>                 \relative $firstnote { $firstnote    $secondnote    
> $thirdnote  }
>                 \relative $sixthnote { $fourthnote  $fifthnote
> $sixthnote }
>    #})

\relative takes a _pitch_ argument, not a music argument.  What problem
are you actually trying to solve?

I don't see that this makes much sense.

-- 
David Kastrup