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Re: Replace ly:music elements in a Scheme function

From: David Kastrup
Subject: Re: Replace ly:music elements in a Scheme function
Date: Mon, 05 Mar 2018 18:12:44 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

paolo prete <address@hidden> writes:

> I see.
> Then I ask if is it possible at least, by placing a simple instruction
> inside lambda (x y) ( ...) while iterating,  to:
> 1) replace x with a rest


> 2) add a list of articulations (for example:  "->", "\mp") to x


Same reason:

>> No.  x and y are values stored in lists.  The relation to their lists
>> is not passed into your function, so you cannot change it there.
>> You'd need to use something like pair-for-each to modify the first
>> list in-place, and that gets old fast as music structures change.
>> There is an actual reason functions like map-some-music are provided.

David Kastrup

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